First Step: Prepare your ingredients Begin by chopping 1 medium onion, 1 green bell pepper, 1 jalapeño (remove seeds for less heat), and mincing 3 garlic cloves. Preheat your oven to 350°F (175°C) and line a baking sheet with foil for later use. Optional: thinly slice 2 scallions if you want extra freshness and flavor in your beef mixture.

Second Step: Cook the ground beef and vegetables Heat 1 teaspoon olive oil in a large skillet over medium heat. Add the lean ground beef, chopped onion, bell pepper, jalapeño, and scallions (if using). Cook for about 7-10 minutes, breaking up the beef and stirring frequently until the meat loses its pink color and the vegetables soften. Drain any excess fat to avoid a greasy sandwich filling.

Third Step: Season and simmer Reduce heat to medium-low. Stir in minced garlic, 2 teaspoons garlic salt, 1 teaspoon chili powder, 1 teaspoon paprika, 1 teaspoon black pepper, ½ teaspoon cumin, and ½ teaspoon cayenne pepper. Allow the spices to toast gently with the mixture for about 2 minutes, stirring continuously; this helps bring out their aromatic qualities.

Fourth Step: Add tomato sauce and cheese Pour 8 ounces of tomato sauce into the skillet, mixing thoroughly. Immediately sprinkle in 3 cups of shredded pepper jack cheese, stirring until it melts evenly into the beef mixture, creating a rich, creamy consistency. Remove from heat.

Fifth Step: Prepare the buns Slice your 8 sandwich buns in half and spread ½ cup mayonnaise evenly on both the top and bottom halves. This acts as a moisture barrier and adds flavor. Heat a separate skillet over medium-high heat and lightly grill each bun half until golden brown. This toasting step helps prevent sogginess during baking.

Sixth Step: Assemble the sandwiches Place the bottom halves of the buns on the lined baking sheet. Generously spoon the cheesy minced beef mixture onto each. Top each sandwich with a slice of Colby Jack cheese or your preferred cheese alternative, such as aged gouda, for extra flavor intensity.

Final Step: Bake and serve Cover each sandwich with the top bun halves. Brush the tops lightly with 2 tablespoons melted butter to ensure a crisp, golden crust when baked. Place the baking sheet in the preheated oven and bake for 12-15 minutes until buns are heated through and cheese is nicely melted. Carefully remove the sandwiches from the oven and serve immediately while hot.