A retro comfort snack: bread spread thick with a smooth melted-cheddar sauce, topped with bacon and broiled until bubbly and blistered. Fast, salty, irresistible.
Preheat the broiler and place the rack in the highest position.
In a small saucepan over medium-high heat, bring the milk to a boil. Reduce the heat to low and gradually add half of the grated cheese, whisking vigorously until smooth. Incorporate the remaining cheese, continuing to whisk constantly. Whisk in the butter.
Position the slices of bread on a baking sheet. Divide the cheese sauce among the slices and spread to the edges. Top each with a slice of cooked bacon and broil until the cheese is bubbly and blackened in spots, watching very closely — about 3 minutes.
Notes
Whisk for a smooth sauce: Add the cheese gradually off a hard boil and whisk constantly so it melts silky, not stringy.Watch the broiler: Blackened spots happen fast — don't walk away.Highest rack: Position the bread close to the element for quick, blistery browning.Pre-cook the bacon: Use already-cooked bacon so it just crisps under the broiler.