Preheat oven to 450° F. Prepare a 9 x 13 inch baking pan by spraying it with non-stick pan spray. Or line a rimmed baking sheet with foil and spray with pan spray.

To make marinade, combine olive oil and fresh lemon juice in a small bowl. Add minced garlic, kosher salt, and cracked pepper and set aside.

Cut broccoli and cauliflower into florets of similar size. You can use the longer broccoli stems too. Place into a large bowl.

Swirl the marinade to mix the ingredients together again and pour all but 1 Tbsp. onto the broccoli and cauliflower. Sprinkle 1 Tbsp. of grated parmesan into the bowl. Toss all ingredients together until the marinade and parmesan cheese are distributed evenly. I find it easiest to use my hands to do this.

Spread the broccoli and cauliflower mixture evenly into the prepared pan. Sprinkle with remaining parmesan.

Bake at 450° F for 20 to 25 minutes or just until fork-tender. Remove from oven and drizzle with remaining marinade. Serve immediately