Heat the Land O Lakes® Unsalted Butter over medium heat in a skillet. Once hot, add the garlic and sauté for 30 seconds until fragrant. Remove from the heat, add the red pepper flakes and lemon zest. Stir to combine. Let sit at room temperature.
In a large skillet, add the butter and olive oil over medium heat. Add the Brussels sprouts and sauté until golden brown, about 8-10 minutes. Season with salt and pepper.
Cook the pasta according to the package directions. Drain and add the garlic butter sauce and mozzarella to the pasta with the Brussels sprouts. Toss to combine and melt the cheese. Adjust salt and pepper as needed. Serve immediately.