Yellow squash casserole is a comforting, savory dish that highlights tender yellow squash baked with creamy cheese and crunchy toppings. By tweaking traditional ingredients to lower carbs, this casserole becomes an ideal side or light main for keto and low-carb diets without sacrificing flavor or texture.
Ingredients
- 4 cups yellow squash, thinly sliced (about 3 medium squash)
- 1 small onion, finely chopped
- 2 cloves garlic, minced
- 1 cup shredded sharp cheddar cheese
- 1/2 cup grated Parmesan cheese
- 1/2 cup sour cream (full fat)
- 1/4 cup mayonnaise (full fat)
- 2 large eggs
- 1/2 cup almond flour
- 1/4 cup crushed pork rinds (optional, for topping)
- 2 tablespoons butter, melted
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1/2 teaspoon smoked paprika (optional)
- 1/4 teaspoon crushed red pepper flakes (optional, for mild heat)
- 2 tablespoons fresh parsley, chopped (for garnish)
Instructions
- Preheat your oven to 350°F (175°C). Lightly grease an 8×8-inch baking dish or similar size casserole dish.
- Wash and thinly slice the yellow squash. Place the slices in a colander, sprinkle with 1/2 teaspoon salt, and let them sit for 15 minutes to draw out excess moisture. Then, gently squeeze the squash in a clean kitchen towel or paper towels to remove as much water as possible. This step prevents a soggy casserole.
- In a large skillet over medium heat, melt 1 tablespoon of butter. Add the chopped onion and sauté for about 4-5 minutes until translucent. Add the minced garlic and cook for another 1 minute until fragrant. Remove from heat and set aside.
- In a large mixing bowl, whisk together the eggs, sour cream, mayonnaise, salt, black pepper, smoked paprika, and red pepper flakes (if using) until smooth.
- Add the squeezed yellow squash, sautéed onion and garlic, shredded cheddar, Parmesan cheese, and almond flour to the wet mixture. Stir gently until all ingredients are evenly combined.
- Pour the mixture into the prepared baking dish, spreading it out evenly.
- In a small bowl, combine the crushed pork rinds (if using) with the remaining tablespoon of melted butter. Sprinkle this mixture evenly over the top of the casserole for a crunchy topping. If you prefer, you can substitute with extra almond flour mixed with a little melted butter for a less crunchy but still flavorful crust.
- Bake in the preheated oven for 35-40 minutes, or until the casserole is set, the top is golden brown, and a toothpick inserted in the center comes out clean.
- Remove from the oven and let it cool for about 10 minutes before serving. Garnish with chopped fresh parsley for color and freshness.
Tips
- Substitutions: If you don’t have almond flour, crushed pork rinds or coconut flour can work as low-carb alternatives, but coconut flour absorbs more moisture, so use sparingly.
- Prevent sogginess: Properly draining and squeezing the squash is crucial. Excess water will make the casserole watery and less cohesive.
- Storage: Store leftovers in an airtight container in the refrigerator for up to 4 days. This casserole reheats well but may lose some crispness on top.
- Make it dairy-free: Use dairy-free sour cream and cheese substitutes, and swap butter for coconut oil, but note the flavor and texture will differ.
Serving Suggestions
This low carb yellow squash casserole pairs wonderfully with grilled or roasted meats like chicken, pork chops, or steak. It can also be served alongside a fresh green salad or steamed non-starchy vegetables for a full low-carb meal. For brunch, serve it with scrambled eggs and avocado slices to keep the meal balanced and satisfying.
Variations
To customize this casserole, try adding cooked bacon bits or diced ham for extra protein and smoky flavor. You can also mix in chopped fresh herbs like thyme or rosemary for a more aromatic dish. For a spicier kick, add diced jalapeños or a dash of cayenne pepper. For a creamier texture, replace half of the sour cream with cream cheese, blending it until smooth before mixing in the squash.
Storage and Reheating
Store leftover casserole in an airtight container in the refrigerator for up to 4 days. To reheat, place individual portions on a microwave-safe plate and microwave for 1-2 minutes until warmed through. Alternatively, reheat in a preheated 350°F (175°C) oven for 10-15 minutes until hot. If you want to restore crispiness to the topping, briefly broil for 1-2 minutes at the end of reheating, watching carefully to avoid burning.
Frequently Asked Questions
Can I use zucchini instead of yellow squash?
Yes, zucchini is a great low-carb substitute and works similarly in this casserole. Be sure to drain and squeeze out the moisture just as you would with yellow squash to avoid a watery dish.
Is almond flour necessary in this recipe?
Almond flour helps bind the casserole and adds a subtle nutty flavor while keeping it low carb. You can substitute with crushed pork rinds or coconut flour, but coconut flour requires less quantity due to its absorbency.
How do I make this casserole dairy-free?
Replace the cheese, sour cream, and butter with plant-based alternatives such as vegan cheese, coconut-based sour cream, and coconut oil. Keep in mind that the texture and flavor will change, but it will still be delicious.
Can I prepare this casserole ahead of time?
Absolutely. You can assemble the casserole a day ahead, cover it tightly, and refrigerate. Bake it fresh when ready, adding 5-10 extra minutes to the baking time if baking from cold.
How can I make this casserole crispier on top?
Using crushed pork rinds mixed with melted butter as a topping adds crunch without carbs. Alternatively, add a sprinkle of Parmesan cheese on top before baking or broil for the last 2 minutes of cooking to brown the surface.
Is this casserole suitable for keto diets?
Yes, this recipe is designed to be low in carbohydrates by using yellow squash, almond flour, and high-fat dairy, making it an excellent keto-friendly side dish or light meal option.
With these tips and variations, you can enjoy a flavorful, low-carb yellow squash casserole that fits your dietary needs while satisfying your comfort food cravings.
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