Slice donut in half width-wise to create two slices. Cut the bacon in half crosswise. Cut each of the cheese slices into 3 strips.
Flip the donut slice over so the cut side will be on the outside. Overlap cheese slices along the top of the donut slice to cover. Add bacon slices and drizzle with maple syrup. Top with remaining cheese slices and the second half of the donut with the cut side facing out.
Pre-heat skillet over medium heat. Add the butter and swirl to melt. Place sandwich in pan and cook on both sides until golden brown and cheese is melted, about 1 minute per side. Cut and serve.