Mini Philly Cheesesteaks

Ingredients (15)

• + 2 tablespoons butter, or as needed add to pantry
• ✓ 2 tablespoons all-purpose flour, or as needed
• ✓ 1 cup cold milk
• + 2 ounces shredded provolone cheese, or more to taste add to pantry
• + 1 pinch ground nutmeg add to pantry
• + 1 pinch cayenne pepper add to pantry
• + salt to taste add to pantry
• + 1 (12 ounce) skirt steak add to pantry
• + salt and freshly ground black pepper to taste add to pantry
• + salt and freshly ground black pepper to taste add to pantry
• + 3 tablespoons olive oil, divided, or as needed add to pantry
• + ¼ cup water add to pantry
• + ⅓ cup diced onion add to pantry
• + ⅓ cup diced sweet peppers add to pantry
• + 2 baguettes, or as needed, cut into 48 1/2-inch thick slices add to pantry