Simple seasonings and parmesan cheese enhance the flavors of naturally delicious oven-roasted asparagus with parmesan. If you're wondering how long to cook roasted asparagus we recommend 5-8 minutes, or until it's crisp but tender. This classic side is perfect to pair with a dinner on the grill or next to cheesy casseroles. Love your veggies, especially when it's roasted asparagus with parmesan.