Preheat your oven to 400 F (250 Celsius degrees)
Slice the top of each garlic head. On a baking sheet, place the garlic and red bell peppers and drizzle with some olive oil, salt and pepper. Roast for about 1 hour.
Once roasted, remove the vegetables from the oven and let them cool. Adjust the oven to 425 F.
Peel the skin from the red peppers and squeeze the roasted garlic cloves out of their skin.
In a food processor, blend the peeled red pepper, garlic and softened butter.
Horizontally slice the brioche bread into top and bottom halves.
Spread the garlic-red pepper butter on the bread and top with mozzarella cheese.
Bake for 10-15 minutes or until the cheese melts.
Garnish with some dried parsley and slice into even pieces.
Enjoy while warm!