Preheat your smoker, grill or oven to 350 degrees F.

Sautee chopped onion in butter in a large skillet on medium high heat until onions are translucent

Place Peppers in a pot of boiling water for roughly 3-5 minutes until somewhat tender then remove and drain them of any water

Add Ground Beef to the sautéed onions and brown with salt and pepper

While ground beef is cooking, cook riced cauliflower in microwave

Add cauliflower to ground beef mixture along with heavy cream and marinara sauce

Let simmer for 5-10 minutes then remove from heat

Fill peppers with ground beef mixture and top with mozzarella and parmesan cheese.

Place peppers on a cookie sheet and cook for 20-30 minutes or until cheese is melted and browned

Let cool 5-10 minutes and enjoy!