1Heat the olive oil in a large skillet over medium heat.
Add the minced garlic and sliced onion to the skillet and sauté until the onion becomes translucent.
Add the sliced mushrooms to the skillet and cook until they are tender and golden brown.
Stir in the cayenne pepper and mix well to coat the mushrooms and onions.
Remove the skillet from heat and let it cool slightly.
In a large salad bowl, combine the spinach with the cooked mushroom mixture.
Drizzle the lemon juice over the salad and toss gently to combine.
Serve immediately and enjoy your Spicy Mushroom and Spinach Salad.