A delicious and hearty toasted sandwich filled with layers of melted cheese, savory meats, and fresh vegetables.
Preheat your oven to 450°F.
Ensure the oven is fully preheated for even baking.
Slice the baguette in half lengthwise and hollow out some of the bread from the top and bottom halves.
Save the removed bread for making breadcrumbs later.
Spread the mustard evenly on the cut sides of the bread.
Use a spatula for an even spread.
Layer the mozzarella cheese, provolone cheese, red onion, deli turkey, monterey jack cheese, and tomato slices on the bottom half of the bread.
Arrange the layers evenly for consistent flavor in every bite.
Place the top half of the bread back on and wrap the sandwich tightly in aluminum foil.
Wrapping tightly helps the sandwich heat evenly.
Place the wrapped sandwich on a baking sheet and bake for 12-15 minutes until heated through.
Check the sandwich halfway through to ensure even heating.
Remove the sandwich from the oven, unwrap it, and add the romaine lettuce on top of the tomato layer.
Adding the lettuce after baking keeps it crisp and fresh.
Cut the sandwich into wedges and serve warm.
Use a sharp knife to make clean cuts.
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