Preheat oven to 375F.
Prepare crostini: Flatten each slice of Martin’s Butter Bread using a rolling pin. Use a cookie cutter or knife to cut out shapes and remove crusts. Arrange crostini on a prepared baking sheet and spray with cooking spray. Bake for 5-10 minutes or until slightly crispy. Remove and set aside.
Meanwhile, in a large bowl, combine cream cheese, sour cream, mayonnaise and hot sauce. Mix until combined. Stir in cheddar cheese, mozzarella cheese, pepper jack cheese, green onions, and bacon. Note: Reserve some crumbled bacon and green onions to use for garnish.
Carefully spoon dip into 9×9” baking dish and top with Parmesan cheese.
Bake dip for 30-45 minutes or until heated through and cheese is completely melted.
Garnish with reserved crumbled bacon and sliced green onions. Serve immediately, with crostini for dipping.