Heat oven to 400 degrees
On medium high heat, heat olive oil and saute pork, while using a wooden spoon to crumble the meat
After about one minute add in onions and season with salt, pepper, onion powder, garlic powder, red pepper flakes, chili powder and italian seasoning
While the meat cooks, prepate jumbo shells according to package nstructios
After about 10 minutes, pork should be done cooking. Remove it from the heat and transfer to a bowl to prepare the filling
Add pork, breadcrumbs, spinach, marinara, white cheddar cheese, and parmesean cheese together and mix well until combined and stuff the shells with about 2 tbsp of filling depening on the size of shells
To a cast iron skillet or oven safe pan, add a thin layer of marinara sauce to the bottom and then cheese, add the stuffed shells on top being sure not to layer them but instead nestle them closely next to each
Add in the mozarella cheese in between the shells for a cheese pull effect
Top with more white cheddar cheese and finely chopped spinach and bake at 400 degrees for 15 minutes until cheese is completly melted and the dish is bubbling on the corners
Allow it to cool for 5-10 minutes then serve