Preheat the oven to 425°F and lay out a large sheet of parchment paper. If you're using store bought pizza dough, check the instructions as it may need to rest at room temperature while you prepare the topping.

In a large skillet, warm the olive oil over medium-low heat. Add the onion and cook for about 3 minutes. Then add the garlic and cook for another 2 minutes, until fragrant. Toss the sliced brussels sprouts into the skillet and stir together. Allow to cook for 2 more minutes then squeeze in the lemon juice and zest. Stir to combine.

Lightly flour the parchment paper then roll the pizza dough out into large rectangle. Top pizza dough with the oil and vegetables in the skillet then sprinkle cheese on top. Carefully transfer the parchment paper to the oven and bake for 12 minutes, until light golden brown on top. Slice and serve warm.