Cook bacon in a skillet over medium heat until crisp, then drain on paper towels.​

Make the shrimp topping

2) Pat shrimp dry, season with Cajun/Old Bay (optional), salt, and pepper.​

3) Heat butter in a skillet over medium-high heat, add garlic for ~30 seconds, then cook shrimp 1–2 minutes per side until pink and just cooked through; finish with lemon juice.​

Cook the beef patties and melt cheese

4) Form 4 patties (slightly wider than the buns) and season with salt and pepper.​

5) Pan-sear or grill over medium-high heat until done to your preference, then add a slice of cheese to each patty and cover briefly to melt.​

6) Toast buns, add lettuce to the bottom bun, place the cheesy beef patty on top, then add crispy bacon.​

7) Spoon the garlicky shrimp over the bacon, add spicy mayo if using, and close with the top bun.