01 -
In a large mixing bowl, whisk together flour, baking powder, kosher salt, and granulated sugar until evenly blended.
02 -
In a separate medium bowl, whisk together milk, sour cream, egg, and melted butter until smooth.
03 -
Gently fold the dry mixture into the wet mixture, stirring until just combined. Avoid overmixing for best texture.
04 -
Preheat a large skillet over medium heat and brush with melted butter. Pour about 1/3 cup of batter per pancake onto the skillet; repeat for two pancakes. Cook until bubbles form on the surface, approximately 3 to 4 minutes.
05 -
Flip one pancake and immediately top with 1/4 cup shredded cheddar, 1/4 cup shredded mozzarella, 1 tablespoon Parmesan, and a pinch of black pepper. Flip the second pancake. Continue cooking until the cheese melts and the underside becomes golden brown, about 3 minutes.
06 -
Place the plain pancake atop the cheesy side to form a sandwich. Evenly spread 1/2 tablespoon mayonnaise over the top pancake. Carefully flip and cook until a golden crust develops, about 1 minute. Spread the remaining 1/2 tablespoon mayonnaise on the top, flip, and brown the second side for 1 minute more.
07 -
Repeat the process with remaining batter, cheeses, and mayonnaise until all are used.
08 -
Transfer finished pancakes to plates. Serve warm with maple syrup and garnish with crumbled bacon if desired.