Preheat and oven to 350 degrees. Spray an oven-safe baking dish with pan spray. Prepare the mini sweet peppers by cutting off the tops. Slice each pepper in half and remove any seeds. Arrange the pepper halves in the baking dish.
Step 2
Heat the olive oil in a medium sized skillet. Cook the ground beef, salt, pepper, mustard powder, and onion powder on medium-high heat until the beef is cooked through.
Step 3
Chop the spinach and mix this into the ground beef in the final minute of cooking.
Step 4
Turn off the heat, and spoon the beef mixture into the peppers. Overflow is okay.
Step 5
Top off the peppers with the shredded cheddar cheese. Bake the peppers in the oven for 10 minutes – until the cheese melts and becomes slightly golden.