Mix the roasted pepper, mayonnaise, sour cream, peanut butter, red pepper flakes, to taste, and salt, and pepper, to taste, in the blender or food processor and process until smooth and creamy. Set aside.
Spread 4 slices of bread with peanut butter and 4 slices with mustard. Divide the grated mozzarella and pecorino cheeses, and the herbs on the peanut butter slices. Top with the prosciutto and Parmesan and cover with the mustard-coated slices.
Add the milk to a wide shallow dish and dip the sandwiches on both sides lightly coating in milk and put them on a baking dish greased with oil. Drizzle with the olive oil and cook in the oven until golden brown.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.