Quick and easy recipe for a delicious Mushroom and Spinach Stir Fry

Ingredients:
200g mushrooms, sliced
2 cups fresh spinach leaves
1 small onion, finely chopped
2 cloves garlic, minced
1-inch piece of ginger, grated
2 tablespoons soy sauce
1 tablespoon olive oil
Salt and pepper to taste
Optional toppings: sesame seeds, chopped green onions