Gather the ingredients. Begin by frying the bacon in a cast iron skillet. Turn the heat to medium and cook the bacon until crispy. Remove the bacon and place it on a paper towel, saving the rendered bacon grease in a small container.
Next, slice your donut in half, being careful not to crush or remove any of the exterior glaze. Drizzle a little of the reserved bacon grease in the skillet and add the sliced doughnut halves, interior side down. Toast the doughnut halves until golden brown. Remove them from heat and set them aside.
Meanwhile, start shaping your beef patty into a ball and sprinkling the outside with salt and pepper. Heat the cast iron skillet with the rendered bacon fat to medium-high and add the seasoned ball of beef. Let the beef ball cook for 3 to 5 minutes until crispy and golden brown. Flip the ball and smash slowly so the burger stays together.
Let the burger cook for a few more minutes until the desired doneness is reached, about 5 to 10 minutes. Flip the burger one more time, add the cheese, and then remove it from the heat. Cover it for 2 minutes until the cheese has melted.
Add the bacon to the top of the cheese cheeseburger patty then place it into the toasted doughnut. Serve immediately and enjoy.