Preheat your oven to 350°F (175°C).

Melt 2 tablespoons of unsalted butter in a skillet over medium heat. Add 1 chopped onion and 1 sliced bell pepper, cooking until softened, about 5–7 minutes.

Add 1 pound of ribeye or ground beef to the skillet. Cook for 5–8 minutes until browned.

Stir in 1 cup of provolone cheese until melted and well mixed.

Slice the top third off the garlic bread loaf and hollow it out.

Fill the hollowed loaf with the beef and cheese mixture.

Wrap the stuffed loaf in aluminum foil and bake for 25 minutes.

Unwrap and bake uncovered for an additional 5–10 minutes to crisp the crust.

Let it cool for a few minutes before slicing to serve.