You probably know how to assemble a sandwich—but you may not know that cooking bacon on a sheet pan eases sandwich assembly (and cleanup!), giving you time to focus on frying eggs like a pro.
Preheat oven to 375°F. Place a wire rack on top of a large rimmed baking sheet. Arrange bacon slices evenly on rack. Bake on center rack of oven for 15-20 minutes. Remove from oven and let cool 5 minutes.
Pre-assemble sandwiches: layer a handful of arugula, 2-3 slices bacon, 1 slice cheese, and tomato atop one slice of bread. Repeat for each sandwich.
Fry the eggs: melt 1 tablespoon butter in a nonstick skillet over medium heat. Crack 3-4 eggs into skillet and sprinkle with salt & pepper. Cook 1 minute, until whites are slightly opaque. Reduce heat to low, cover skillet with lid and cook 4-6 minutes more, to desired level of yolk doneness.
Using a spatula, carefully lift eggs out of skillet and slide onto prepared sandwich halves. Top with second slice of bread. Cook remaining eggs following steps above and assemble remaining sandwiches. Serve immediately.