Making Baked Italian Grinder Sandwiches is simple when you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Bread: Slice the Italian or hoagie bread in half lengthwise. Hollow out some of the bread from the inside to create space for the fillings.
3. Mix the Oil and Spices: In a small bowl, combine the olive oil, Italian seasoning, garlic powder, salt, and pepper.
4. Brush the Bread: Brush the inside of both halves of the bread with the olive oil mixture.
5. Layer the Ingredients: Start layering the meats on the bottom half of the bread. Add salami, pepperoni, and ham, followed by provolone cheese.
6. Add the Veggies: Top the meat and cheese with roasted red peppers, fresh spinach or arugula, and any other optional ingredients like olives or banana peppers.
7. Cover with Cheese: Add another layer of provolone cheese on top of the veggies for extra gooeyness.
8. Close the Sandwich: Place the top half of the bread back on the sandwich.
9. Wrap in Foil: Wrap the entire sandwich tightly in aluminum foil to keep it moist while baking.
10. Bake: Place the wrapped sandwich in the preheated oven and bake for 25-30 minutes, or until the cheese is melted and the bread is crispy.
11. Slice and Serve: Remove from the oven, unwrap, and slice into individual servings. Enjoy warm!