Lay the bread slices on work surface and spread with pizza sauce. Top half with 1 slice of the mozzarella, then pepperoni, pepper and mushrooms, if using. Place remaining cheese on top. Top with remaining bread slices; set aside.
In shallow dish, whisk together eggs, milk, cheese, oregano, salt and pepper. Dip sandwiches into egg mixture, turning to soak up the egg mixture.
In large non-stick skillet or griddle, melt butter over medium heat and cook sandwiches, turning once for about 4 minutes per side or until brown and crisp and cheese is melted.
Peanut Butter and Banana Variation: Omit pizza sauce, pepper, mushrooms and cheese. Substitute ½ cup (125 mL) smooth or crunchy peanut butter and 2 large bananas, thinly sliced. Omit cheese, oregano and pepper from egg mixture and use ½ tsp (2 mL) ground cinnamon. 4 minutes per side or until brown and crisp.
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