Preheat and prep: Heat the oven to 400°F (200°C). Line a rimmed baking sheet or pizza pan with parchment and lightly grease it to prevent sticking.
Mix the crust: In a large bowl, whisk eggs, heavy cream, Italian seasoning, garlic powder, salt, and pepper.
Stir in 1 cup of shredded mozzarella and all the Parmesan.
Form and bake the base: Pour the mixture onto the lined pan, spreading it into a thin, even layer about 1/4 inch thick. Bake for 10–12 minutes until set and lightly golden at the edges.
Add the sauce: Remove the crust from the oven. Spread the low-carb sauce in a thin layer over the surface.
Don’t overdo it—too much sauce can make it soggy.
Layer the toppings: Sprinkle on the crumbled sausage or bacon, bell pepper, red onion, and spinach. Top with the remaining 1/2 cup mozzarella. Add red pepper flakes if you like heat.
Finish baking: Return to the oven for 6–8 minutes, until the cheese is melted and bubbly.
Optional broil: For browned, blistered cheese, broil for 1–2 minutes.
Watch closely to avoid burning.
Rest and slice: Let the pizza sit for 3–5 minutes so the crust firms up. Slice into squares or wedges and serve hot.