Tex-Mex Keto Squash Casserole
Cheesy, creamy, and low carb, Tex-Mex Keto Squash Casserole is the ideal side dish for any occasion. This delightful casserole blends fresh summer squash with zesty flavors, making it a great addition to family dinners or potlucks. It stands out not only for its delicious taste but also for being a healthy option that fits perfectly into your keto lifestyle.
Why You’ll Love This Recipe
- Easy to Prepare – With simple ingredients and straightforward steps, this casserole comes together quickly for any weeknight dinner.
- Packed with Flavor – The combination of cheddar cheese, sour cream, and Rotel tomatoes delivers a burst of Tex-Mex flavor that everyone will love.
- Versatile Side Dish – This casserole pairs well with grilled meats or can be served as a vegetarian main course.
- Low Carb Delight – Perfect for those following a keto diet, this dish keeps carbs low while satisfying your cravings.
- Family-Friendly – Kids will enjoy the cheesy goodness while getting their veggies in without fuss.

Tools and Preparation
To make your Tex-Mex Keto Squash Casserole, gather the necessary tools and prepare your kitchen for cooking. Having the right equipment ensures that your cooking process is smooth and enjoyable.
Essential Tools and Equipment
- Large skillet
- Medium-sized casserole dish
- Mixing bowl
- Cutting board
- Knife
Importance of Each Tool
- Large skillet – Essential for cooking the squash and onions evenly and allowing excess moisture to evaporate.
- Mixing bowl – Provides ample space to combine all ingredients thoroughly without mess.
- Casserole dish – Ideal for baking your casserole to perfection while ensuring even heating.
Ingredients
Cheesy, creamy and low carb squash casserole makes the perfect side dish.
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 bakes evenly.
Step 2: Cook the Vegetables
- Heat olive oil in a large skillet over medium heat.
- Add sliced summer squash and diced onion to the skillet.
- Cook while stirring occasionally until both are tender, about 8-10 minutes.
- Drain any excess liquid from the cooked vegetables.
Step 3: Combine Ingredients
In a large mixing bowl:
Stir together the drained squash/onion mixture with the remaining ingredients (except reserved cheese).
Adjust salt and pepper according to taste.
Step 4: Transfer to Casserole Dish
Pour the mixture into a medium-sized casserole dish.
Sprinkle the reserved cheese on top for an extra cheesy finish.
Step 5: Bake Until Golden
Bake in preheated oven until cheese is melted and bubbly, approximately 20-30 minutes.
Allow to set for about 5-10 minutes before serving. Enjoy your delicious Tex-Mex Keto Squash Casserole!
How to Serve Tex-Mex Keto Squash Casserole
Tex-Mex Keto Squash Casserole is a versatile dish that pairs well with many meals. Its cheesy goodness complements various flavors, making it an excellent choice for gatherings or family dinners. Here are some serving suggestions to enhance your dining experience.
As a Standalone Dish
- Enjoy it hot: Serve the casserole directly from the oven for maximum cheesiness.
- Top with fresh herbs: Garnish with cilantro or parsley for a pop of color and freshness.
Pairing with Protein
- Grilled chicken: The smoky flavor of grilled chicken pairs beautifully with the creamy casserole.
- Chili con carne: Serve alongside spicy chili for a delightful Tex-Mex feast.
Accompanying Salads
- Avocado salad: A refreshing avocado salad balances the richness of the casserole.
- Caesar salad: A classic Caesar complements the flavors without overpowering them.
Serving with Dips
- Guacamole: This creamy dip adds a tasty contrast to the casserole’s texture.
- Salsa: A zesty salsa provides an extra layer of flavor and freshness.
How to Perfect Tex-Mex Keto Squash Casserole
To ensure your Tex-Mex Keto Squash Casserole turns out perfectly every time, follow these helpful tips.
- Use fresh squash: Fresh summer squash will provide better texture and flavor than frozen options.
- Don’t skip draining: Properly drain the cooked squash to avoid a watery casserole.
- Experiment with cheese: While cheddar is great, try blending different cheeses like Monterey Jack for variety.
- Adjust spices to taste: Feel free to add more spices or even jalapeños for extra heat if desired.
- Let it rest before serving: Allowing the casserole to sit for 5-10 minutes helps it set up nicely and makes serving easier.
Best Side Dishes for Tex-Mex Keto Squash Casserole
Pair your Tex-Mex Keto Squash Casserole with these delicious side dishes to create a well-rounded meal.
- Black bean salad: A refreshing mix of black beans, corn, and bell peppers adds protein and crunch.
- Mexican street corn (Elote): Grilled corn on the cob slathered in mayo, cheese, and spices enhances your meal’s Mexican flair.
- Zucchini fritters: Crispy zucchini fritters provide a delightful crunch that complements the creamy casserole.
- Spicy coleslaw: A tangy coleslaw brings brightness and crunch, balancing the rich flavors of the casserole.
- Cauliflower rice: Light and low-carb, cauliflower rice is an excellent base for serving alongside this dish.
- Stuffed jalapeños: Cheesy stuffed jalapeños add a spicy kick that pairs well with the Tex-Mex flavors.
Common Mistakes to Avoid
Cooking a Tex-Mex Keto Squash Casserole can be simple, but it’s easy to make mistakes. Here are some common pitfalls to avoid.
- Overcooking the Squash: Cooking squash too long can lead to a mushy texture. Aim for 8-10 minutes until just tender.
- Skipping the Drainage: Not draining the liquid from the squash can make your casserole watery. Always drain before mixing in other ingredients.
- Ignoring Seasoning: Failing to adjust salt and pepper can result in bland flavors. Taste your mixture before baking and adjust as needed.
- Not Preheating the Oven: Baking in a cold oven can affect cooking time and texture. Always preheat to 350 degrees before starting.
- Using Low-Quality Cheese: Low-quality cheese won’t melt well and may affect taste. Use good quality cheddar for the best results.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftovers in an airtight container.
- Keep in the refrigerator for up to 3 days.
Freezing Tex-Mex Keto Squash Casserole
- Freeze in a tightly sealed container or freezer bag.
- Can be stored for up to 3 months.
Reheating Tex-Mex Keto Squash Casserole
- Oven: Preheat to 350°F and bake for about 20 minutes until heated through.
- Microwave: Heat on medium power for 2-3 minutes, stirring halfway through.
- Stovetop: Warm over low heat, stirring often until hot.
Frequently Asked Questions
Here are some frequently asked questions about this delicious recipe.
What is Tex-Mex Keto Squash Casserole?
Tex-Mex Keto Squash Casserole is a low-carb dish made with summer squash, cheese, and spices, perfect for those on a ketogenic diet.
Can I customize my Tex-Mex Keto Squash Casserole?
Yes! Feel free to add ingredients like bell peppers or jalapeños for extra flavor or spice.
How do I make Tex-Mex Keto Squash Casserole dairy-free?
You can substitute dairy products with plant-based alternatives such as almond milk yogurt or vegan cheese.
What should I serve with Tex-Mex Keto Squash Casserole?
This casserole pairs well with grilled chicken or fish, making it a versatile side dish.
Final Thoughts
The Tex-Mex Keto Squash Casserole is not just cheesy and creamy; it’s also a fantastic way to enjoy vegetables while sticking to your dietary goals. Feel free to customize it with your favorite ingredients, making it as spicy or mild as you prefer. Enjoy this comforting dish at your next gathering!
Tex-Mex Keto Squash Casserole
Indulge in the delightful flavors of Tex-Mex Keto Squash Casserole, a creamy and cheesy dish that perfectly complements any meal. This low-carb casserole combines fresh summer squash with zesty cheddar cheese, sour cream, and Rotel tomatoes, creating a satisfying side dish that fits seamlessly into your ketogenic lifestyle. Easy to prepare and packed with flavor, this casserole is not only family-friendly but also a great way to sneak in some veggies without complaint. Whether served alongside grilled meats or as a vegetarian main course, this comforting dish will be a hit at any gathering.
- Prep Time: 15 minutes
- Cook Time: 30 minutes
- Total Time: 45 minutes
- Yield: Serves approximately 6 people 1x
- Category: Side Dish
- Method: Baking
- Cuisine: Tex-Mex
Ingredients
- 1 tsp olive oil
- 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
- Salt and black pepper to taste
Instructions
- Preheat your oven to 350°F.
- Heat olive oil in a large skillet over medium heat. Add sliced summer squash and diced onion; cook for about 8-10 minutes until tender. Drain excess liquid.
- In a mixing bowl, combine the cooked vegetables with the remaining ingredients except for the reserved cheese; season with salt and pepper.
- Transfer the mixture to a casserole dish and sprinkle with reserved cheese.
- Bake for 20-30 minutes until bubbly and golden brown. Let sit for 5-10 minutes before serving.
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 290
- Sugar: 3g
- Sodium: 540mg
- Fat: 22g
- Saturated Fat: 9g
- Unsaturated Fat: 11g
- Trans Fat: 0g
- Carbohydrates: 10g
- Fiber: 3g
- Protein: 12g
- Cholesterol: 50mg