- 2 slices bacon, cut in half
- 1 teaspoon butter
- 2 slices sourdough bread
- 2 ounces Gouda cheese, or to taste
- 1 tablespoon caramelized onions
- Place bacon in a skillet over medium-high heat; cook, turning occasionally, until evenly browned, about 10 minutes. Drain bacon on paper towels; drain all but about 2 teaspoons bacon fat from the pan.
- Butter each slice of sourdough bread on one side. Place bread, buttered-side down, in same skillet over medium low heat. Place ingredients evenly on one slice of bread in this order: half of Gouda cheese, bacon slices, caramelized onions, and remaining half of Gouda cheese. Top with second bread slice, buttered-side up.
- Cook sandwich until cheese on bottom is melted and bottom slice of bread is golden brown, about 5 minutes; turn sandwich over and cook until all cheese is melted and sandwich is golden brown on both sides, about 5 minutes more.