Buttery croissant, crispy bacon, melted cheese, runny egg. This high calorie breakfast sandwich is flaky perfection that you can eat with one hand.
Preheat oven to 350°F and warm the croissants on a rack for 4-5 minutes, until lightly crisp outside.
Heat a skillet over medium heat and cook the bacon slices until deeply golden and crispy, about 6 minutes per side. Drain bacon on paper towels.
Add butter to the same skillet, reduce heat to low, then crack the eggs in. Sprinkle with salt and pepper, and cook gently until whites are just set but yolks remain runny, 3-4 minutes.
Slice warm croissants horizontally, but do not cut all the way through. Layer cheddar cheese on the bottom half of each and return croissants to oven for 2 minutes, until cheese gently melts.
Layer crispy bacon and runny egg on top of melted cheese. Close the croissant sandwich, pressing lightly to hold together. Serve immediately while still hot and flaky.