Line a baking sheet with aluminum foil and spray with nonstick cooking spray (I like avocado oil spray).
Add ground beef to a medium skillet. Heat over medium-high heat, and brown the meat. When fully cooked, add water (more if needed) and taco seasoning and mix well until ground beef is coated. If there is excess water, continue cooking until it evaporates.
Place cut bell peppers on the baking sheet making sure the middle of each one is facing up.
Add ground beef evenly to peppers.
Sprinkle cheese onto the ground beef mixture.
Bake for 10 to 15 minutes until the bell peppers are desired tenderness.