Preheat oven to 375°F.
In a skillet, cook the sliced sausage and onion until the onion is tender and the sausage is lightly browned. Set aside.
In a 10 x 6.5 casserole dish, add: ground beef, cottage cheese, pizza sauce, most of the parmesan, sautéed sausage + onion, bell peppers, seasonings.
Add about ⅓ of the mozzarella, then gently mix everything right in the dish—just enough to distribute (no need to fully combine).
Top with: remaining mozzarella, turkey pepperoni, jalapeños (if using).
Bake for ~45 minutes, or until hot, melted, and lightly browned on top.
Finish with reserved parmesan + fresh basil.
Let sit for a few minutes before serving (it will thicken slightly as it rests).
