Tex-Mex Keto Squash Casserole
Cheesy, creamy, and full of flavor, the Tex-Mex Keto Squash Casserole is the perfect side dish for any occasion. This delightful recipe combines fresh summer squash with zesty ingredients, making it a great addition to your meal plan. Whether you’re hosting a dinner party or enjoying a cozy family meal, this casserole is sure to impress. Plus, it’s low in carbs and packed with cheesy goodness, making it an ideal choice for those following a keto lifestyle.
Why You’ll Love This Recipe
- Quick to Prepare: With just 15 minutes of prep time, you can have this delicious dish ready for the oven.
- Versatile Flavor: The combination of roasted squash and zesty tomatoes brings a unique Tex-Mex flair that complements many meals.
- Healthy Comfort Food: Enjoy the comforting taste of casserole while keeping your carb intake low.
- Great for Meal Prep: Make it ahead of time and reheat for an easy side on busy days.
- Crowd-Pleasing Dish: Perfect for gatherings, everyone will love this cheesy delight.
Tools and Preparation
Before you get started on making your Tex-Mex Keto Squash Casserole, gather your essential tools. Having everything ready will streamline the cooking process and make it more enjoyable.
Essential Tools and Equipment
- Large skillet
- Medium-sized casserole dish
- Mixing bowl
- Cutting board
- Knife
Importance of Each Tool
- Large skillet: Ideal for sautéing vegetables quickly and evenly, ensuring they are tender before adding them to the casserole.
- Mixing bowl: A must-have for combining all your ingredients smoothly without mess.

Ingredients
Here’s what you’ll need to make your Tex-Mex Keto Squash Casserole:
For the Casserole
- 1 tsp olive oil
- 2 pounds summer squash, sliced
- 1 cup diced onion
- 1 can rotel tomatoes, drained (may use mild if desired)*
- 1 ½ cups cheddar cheese, grated (reserve 1/2 cup for topping)
- ½ cup sour cream
- ½ cup mayonnaise
- ¼ tsp salt
- ¼ tsp black pepper
How to Make Tex-Mex Keto Squash Casserole
Step 1: Preheat the Oven
Preheat your oven to 350 degrees Fahrenheit. This ensures that your casserole cooks evenly.
Step 2: Sauté the Vegetables
In a large skillet:
1. Heat the olive oil over medium heat.
2. Add the sliced summer squash and diced onion.
3. Cook and stir occasionally until tender—about 8-10 minutes.
4. Drain any liquid released from the squash.
Step 3: Combine Ingredients
In a large mixing bowl:
1. Stir together the drained squash/onion mixture and all remaining ingredients except for the reserved cheese.
2. Adjust salt and pepper according to taste.
Step 4: Assemble the Casserole
Pour the mixture into a medium-sized casserole dish:
1. Sprinkle with reserved cheddar cheese on top.
Step 5: Bake
Bake in preheated oven until cheese is melted and bubbly—about 20-30 minutes. Allow it to set for about 5-10 minutes before serving.
Enjoy your delicious Tex-Mex Keto Squash Casserole as a satisfying side dish!
How to Serve Tex-Mex Keto Squash Casserole
Tex-Mex Keto Squash Casserole is a delightful dish that can be enjoyed in many ways. Its cheesy, creamy texture pairs well with various sides and accompaniments, making it a versatile option for any meal.
With Fresh Avocado
- Adding sliced or diced avocado on top elevates the creaminess and adds healthy fats.
As a Main Dish
- Serve it as a main dish paired with a side salad for a light but satisfying meal.
With Grilled Chicken
- This casserole complements grilled chicken perfectly, offering a hearty and flavorful experience.
Topped with Fresh Herbs
- Garnishing with cilantro or parsley gives an added freshness that brightens the dish.
With Cauliflower Rice
- For those following low-carb diets, serving the casserole over cauliflower rice provides a filling base.
How to Perfect Tex-Mex Keto Squash Casserole
Achieving the perfect Tex-Mex Keto Squash Casserole involves some simple tips to enhance flavor and texture.
- Use fresh squash: Fresh summer squash offers better flavor and texture than pre-packaged options.
- Drain excess liquid: Properly draining the squash ensures the casserole isn’t watery, maintaining its creamy consistency.
- Experiment with cheese: Mixing different types of cheese can enhance flavor; try Monterey Jack or pepper jack for a spicy twist.
- Add spices: A pinch of cumin or chili powder brings out the Tex-Mex flavors without overpowering the dish.
- Let it set: Allowing the casserole to sit for 5-10 minutes after baking helps it firm up for easier serving.
- Reheat properly: When reheating leftovers, do so gently in the oven to maintain texture rather than microwaving.
Best Side Dishes for Tex-Mex Keto Squash Casserole
Pairing your Tex-Mex Keto Squash Casserole with complementary side dishes can create a well-rounded meal. Here are some excellent options:
- Grilled Asparagus: Lightly seasoned and grilled asparagus adds crunch and flavor without extra carbs.
- Zucchini Noodles: Spiralized zucchini tossed in olive oil provides a great low-carb alternative to traditional pasta.
- Mixed Green Salad: A fresh salad with a zesty vinaigrette balances the richness of the casserole.
- Roasted Bell Peppers: Sweet roasted bell peppers add color and sweetness that contrast nicely with the savory casserole.
- Spicy Salsa: A chunky tomato salsa served on the side introduces vibrant flavors and spice.
- Cilantro Lime Quinoa: This protein-rich grain complements the dish while keeping it light and nutritious.
Common Mistakes to Avoid
When preparing your Tex-Mex Keto Squash Casserole, it’s easy to make a few missteps. Here are some common mistakes and tips on how to avoid them:
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Overcooking the Vegetables: Cooking squash and onions for too long can lead to mushy texture. Aim for 8-10 minutes until they are tender but still hold some firmness.
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Not Draining Properly: Failing to drain excess liquid from the cooked squash can result in a watery casserole. Make sure to drain well before mixing with other ingredients.
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Skipping the Cheese Topping: The reserved cheese is essential for a golden, bubbly top. Don’t forget to sprinkle it on before baking!
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Ignoring Seasoning Adjustments: Everyone’s taste is different; always taste your mixture before baking and adjust salt and pepper as needed for the best flavor.
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Using Low-Quality Ingredients: High-quality cheese and fresh vegetables make a difference in flavor. Opt for good-quality cheddar cheese and fresh summer squash.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- The casserole can last up to 3-4 days in the refrigerator.
Freezing Tex-Mex Keto Squash Casserole
- Freeze in an airtight container or heavy-duty freezer bag.
- It’s best consumed within 2-3 months for optimal taste.
Reheating Tex-Mex Keto Squash Casserole
- Oven: Preheat to 350°F (175°C) and heat for about 20 minutes or until warmed through.
- Microwave: Heat in short bursts of 1-2 minutes, stirring between each session until hot.
- Stovetop: Place on low heat in a skillet, stirring occasionally until heated thoroughly.
Frequently Asked Questions
Here are some frequently asked questions about the Tex-Mex Keto Squash Casserole that might help you perfect your dish.
Can I use other types of cheese in this Tex-Mex Keto Squash Casserole?
Yes, feel free to experiment with different cheeses like Monterey Jack or Pepper Jack for added flavor.
What can I serve with Tex-Mex Keto Squash Casserole?
This casserole pairs well with grilled chicken, beef tacos, or a fresh salad for a complete meal.
How do I customize my Tex-Mex Keto Squash Casserole?
You can add ingredients like bell peppers, jalapeños, or spices such as cumin and chili powder for extra zest.
Is this dish suitable for meal prep?
Absolutely! It stores well and is perfect for making ahead of time for quick meals throughout the week.
Final Thoughts
The Tex-Mex Keto Squash Casserole is not only delicious but also versatile. It serves as a fantastic side dish or even a main course when paired with proteins. Don’t hesitate to customize it with your favorite veggies or spices. Give this recipe a try; you won’t be disappointed!
Tex-Mex Keto Squash Casserole
Experience the rich, cheesy goodness of Tex-Mex Keto Squash Casserole, a delightful dish that brings together fresh summer squash and zesty flavors for a satisfying side or main course. This low-carb casserole is creamy, full of flavor, and perfect for any occasion—from family dinners to festive gatherings. With just 15 minutes of prep time, you can create a nutritious meal that’s both comforting and easy to prepare. The combination of cheddar cheese and savory vegetables makes this casserole a crowd-pleaser that everyone will enjoy.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Total Time: 45 minutes
- Yield: Serves approximately 6
- Category: Side Dish
- Method: Baking
- Cuisine: Tex-Mex
Ingredients
- 2 pounds summer squash, sliced
- 1 cup diced onion
- 1 can Rotel tomatoes, drained
- 1 ½ cups cheddar cheese, grated (reserve ½ cup for topping)
- ½ cup sour cream
- ½ cup mayonnaise
- 1 tsp olive oil
- ¼ tsp salt
- ¼ tsp black pepper
Instructions
- Preheat your oven to 350°F (175°C).
- In a large skillet, heat olive oil over medium heat. Add sliced summer squash and diced onion. Sauté until tender, about 8-10 minutes. Drain excess liquid.
- In a mixing bowl, combine the drained vegetable mixture with Rotel tomatoes, cheddar cheese (excluding reserved cheese), sour cream, mayonnaise, salt, and pepper.
- Pour the mixture into a medium-sized casserole dish and sprinkle with reserved cheddar cheese on top.
- Bake for 20-30 minutes until the cheese is melted and bubbly. Let it sit for 5-10 minutes before serving.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 288
- Sugar: 4g
- Sodium: 497mg
- Fat: 22g
- Saturated Fat: 10g
- Unsaturated Fat: 9g
- Trans Fat: 0g
- Carbohydrates: 10g
- Fiber: 3g
- Protein: 12g
- Cholesterol: 45mg