Caramelized Onion & Brussels Sprout Galette

Heat 1 tablespoon oil in a large skillet over medium heat. Add onions and 1/8 teaspoon each salt and pepper; cook, stirring occasionally, until the onions are tender and browned, 15 to 20 minutes. Add water, 1 tablespoon at a time, if they start to burn. Add garlic and cook, stirring, for 1 minute more. Transfer to a large bowl.

Heat the remaining 1 tablespoon oil in the pan. Add Brussels sprouts and the remaining 1/8 teaspoon each salt and pepper. Reduce heat to medium-low and cook, stirring occasionally, until tender and lightly browned, 8 to 10 minutes.

Preheat oven to 400 degrees F. Line a large baking sheet with parchment paper.

Stack pie crusts on top of each other so you have a double-thick crust. Roll out on a lightly floured surface into a 13- to 14-inch circle. Transfer to the prepared baking sheet. Sprinkle 1 cup cheese in the center, leaving a 1 1/2-inch border around the edge. Top the cheese with the onions, then the Brussels sprouts and sprinkle with the remaining 1/2 cup cheese. Fold the edge of the dough over the filling, pleating as you go.

Bake the galette until the crust is lightly browned, 30 to 35 minutes. Let cool for 10 minutes before serving.