Philly Cheesesteak Stuffed Peppers

Ingredients (10)

• + 6 medium green bell peppers - tops, seeds, and membranes removed add to pantry
• ✓ 2 tablespoons olive oil
• ✓ 2 tablespoons butter
• + 1 (8 ounce) package sliced fresh mushrooms add to pantry
• ✓ 1 large onion, sliced
• + 6 sandwich steaks, sliced into strips add to pantry
• + salt and ground black pepper to taste add to pantry
• + salt and ground black pepper to taste add to pantry
• + garlic powder add to pantry
• + 12 slices provolone cheese add to pantry