Prep Ingredients Wash and dry the broccoli and mushrooms. Cut the broccoli into small florets and slice the mushrooms.
Cook Broccoli Heat the olive oil and butter in a large skillet over medium heat. Add the broccoli florets and sauté for 3–4 minutes until slightly tender.
Add Mushrooms Add the mushrooms to the skillet. Sauté for another 4–5 minutes, stirring occasionally, until the mushrooms release their moisture and begin to brown.
Season and Add Garlic Add the minced garlic, salt, black pepper, and red pepper flakes (if using). Cook for 1–2 minutes, stirring constantly, until the garlic is fragrant.
Optional Topping Sprinkle grated Parmesan cheese over the vegetables, if desired, and toss to combine. Cook for another minute.
Serve Transfer the sautéed vegetables to a plate and enjoy immediately as a side dish or light keto meal.