Step 1

Preheat the oven to 375 degrees F.

Step 2

In a large oven-safe skillet over medium heat, cook the bacon until crispy, about 8 minutes.

Step 3

Drain the bacon on a paper-towel-lined plate.

Step 4

Chop the bacon.

Step 5

Return the skillet to medium heat and melt the butter.

Step 6

Add the shallots and the Brussels sprouts to the melted butter.

Step 7

Season the shallots and the Brussels sprouts with the salt and the cayenne pepper.

Step 8

Cook, stirring occasionally, until tender, about 10 minutes.

Step 9

Transfer the skillet from the heat.

Step 10

Drizzle the vegetables with the heavy cream and top with the cheddar, the Gruyere, and the bacon pieces.

Step 11

Bake until the cheese is bubbly, about 12-15 minutes. You can broil it for 1 minute to make sure the cheese is golden.

Step 12

Serve hot.