Cook the ground beef, onion, and bell pepper in a medium-sized skillet over medium heat. Crumble it as it cooks.
Add all remaining ingredients (except for shredded cheese and buns) and stir well to combine.
Simmer over low heat for 10 minutes.
Cut the slider buns through the middle (while still attached). Place the bottom half into a baking dish. Spread the meat onto the buns. Top with the cheese.
Cook under the broiler or in an air fryer for about 3 minutes to melt the cheese. Then place the top buns on and serve.