Preheat the oven to 350 F.
In a large soup pot, bring 8 cups of water to a boil. Reduce heat to medium-high. Using tongs, carefully drop bell peppers in the water and cook for 7- 10 minutes. Peppers should be just tender.
Remove soup pot from heat. Using tongs, carefully remove peppers from the water, making sure there is no water in the cavity of each pepper. Place concave up in a glass baking dish.
In a frying pan, over medium heat, brown ground beef with onion, spices and sea salt.
Spoon cooked beef into peppers.
Top beef with a tbsp (or more) of salsa.
Top each pepper with mozzarella cheese.
Bake about 20 minutes. Cheese should be melted.