Preheat the oven to 400 degrees F.
Make the cheese sauce: heat a medium size saucepan or deep skillet over medium heat. Add the milk, heavy cream, cream cheese, garlic powder, and onion powder. Whisk until smooth.
Once smooth, stir in 1 cup shredded cheddar and the drained pimentos. Simmer, stirring occasionally until the mixture has slightly thickened. Whisk 1 tablespoon corn starch with 1 tablespoon cold water, stir until the sauce until it looks almost too thick, remember the squash will release a lot of moisture as it bakes.
Grease a 7x11 dish. Layer squash, then cheese sauce, salt and pepper to taste, repeating until used up. Top with the remaining cheddar.
Bake 20-25 minutes until golden and bubbly.
Let sit 10 minutes before serving so the sauce sets.
- * Note: For best results, slice the squash 2 days ahead of time and store in an airtight container layered with paper towels to dray out moisture. This is the difference between a creamy casserole and a watery one. Short on time? Salt the slices, let sit in a colander 30 minutes, then press dry with paper towels.
- Net carbs per serving: 6.4g
Serving: 1 slice (1/6th of recipe), Calories: 274kcal, Carbohydrates: 8g, Protein: 11.9g, Fat: 22g, Cholesterol: 63.7mg, Sodium: 339.9mg, Fiber: 1.6g, Sugar: 4g