Preheat your oven to 350°F and lightly grease a 9x13-inch baking dish.
Cook the sausage in a large skillet over medium-high heat, breaking it up with a spoon, until it is thoroughly browned and cooked through.
In a large mixing bowl, whisk together the eggs, heavy cream, and minced garlic. Fold in the freshly grated zucchini without draining it.
Add the coconut flour, baking powder, salt, pepper, and optional red pepper flakes to the bowl. Stir until smooth, then gently fold in your cooked sausage.
Pour the mixture into your prepared baking dish and spread evenly. Top with shredded Cheddar cheese. Bake for 40 to 45 minutes until golden brown and set.
Let the casserole cool and set for 10 minutes before slicing into squares.
Notes
Nutrition per serving: Calories: 342 kcal, Total Carbs: 6.8g, Net Carbs: 4g, Fats: 24.4g, Protein: 19g.