Prepare the Vegetables: Preheat your oven to 400°F (200°C). Cut the cauliflower into small florets. If you're using cauliflower mushrooms, separate them into bite-sized pieces.
Sauté Garlic and Mushrooms: Heat 1 tablespoon of olive oil in a large pan over medium heat. Add the minced garlic and sauté for 1 minute until fragrant. Then, add the cauliflower mushrooms (or regular mushrooms) and cook for about 5 minutes, stirring occasionally, until softened.
Roast the Cauliflower: While the mushrooms are cooking, toss the cauliflower florets with 1 tablespoon of olive oil, salt, and pepper. Spread them on a baking sheet in a single layer and roast for 20 minutes or until golden and tender.
Combine the Mushrooms and Cauliflower: Once the cauliflower is roasted and the mushrooms are cooked, combine them in the pan. Add thyme and stir well to combine. Cook for an additional 3-4 minutes, allowing the flavors to meld together.
Finish and Serve: Remove from heat and add a squeeze of lemon juice for a fresh zing. Garnish with fresh parsley and serve immediately.