Step 1

Preheat oven to 425ºF.

Step 2

In a large bowl whisk together the tomato paste, 3 tablespoons of the olive oil, and Dijon mustard. Note that the olive oil will not fully incorporate. That’s ok. Add 1/4 cup of the Parmesan cheese, the oregano, garlic powder, 1/4 teaspoon salt, and 1/4 teaspoon coarse black pepper.

Step 3

Break a head of cauliflower into florets and add them to the tomato paste mixture. Stir using a spatula to make sure the sauce is getting onto the cauliflower, which should end up stained red. Use the spatula to transfer all the cauliflower and sauce to a large baking sheet, spreading the cauliflower around the outside of the pan.

Step 4

Cut the chicken breasts in half width-wise (to make more square plump pieces rather than long rectangles). Put them in the middle of the pan in a single layer. Brush them with the remaining 2 tablespoons of olive oil and sprinkled with the Italian seasoning, 1/4 teaspoon of salt, and 1/4 teaspoon of coarse black pepper.

Step 5

Roast until cauliflower is darkened in spots and is tender-crisp when stuck with a fork and the chicken is cooked through to 165ºF, about 25 minutes. Sprinkle everything with remaining Parmesan cheese to serve.