Add ricotta cheese, half of the mozzarella cheese, and spices to the bowl (garlic powder, onion powder, oregano). Season the filling well with salt and pepper.
Pour the tomato sauce into the bottom of a large baking dish and spread around to coat the surface. Begin filling the cooked shells with spoonfuls of the ricotta-cauliflower mixture and nestling them into the marinara coated dish. Repeat until your dish is full and sprinkle with the remaining half of the mozzarella.
Bake in oven at 400 degrees for 30 Minutes, until cheesy is bubbly. Garnish with fresh herbs before serving.
Recipe by DomestikatedLife at https://domestikatedlife.com/2019/09/18/cauliflower-stuffed-shells/