In a mixing bowl, combine flour, sugar, baking powder, baking soda, and salt.
Whisk together milk, egg, and melted butter in another bowl, then add wet ingredients to dry ingredients and stir until smooth.
Heat a large skillet over medium heat and coat with cooking spray or a small amount of butter. Pour 1/4 cup of batter onto the skillet for each pancake and cook until bubbles appear on the surface, about 2-3 minutes. Flip and cook the other side for 1-2 minutes, until golden brown. Repeat with the remaining batter.
Place a pancake on a plate. Arrange strawberry slices along the top edge for Santa's hat and place a large marshmallow on the side of the strawberries for the hat’s pom-pom.
Use blueberries or chocolate chips as eyes, a banana slice for the nose, and a small sliver of strawberry for the mouth.
Create swirls of whipped topping for the beard and fluff on the hat. Decorate the edge of the hat with miniature marshmallows.