Vegan Garlic Mushrooms Cauliflower

Contents:
1 medium cauliflower, cut into small florets
2 tablespoons of olive oil
1 small onion, finely chopped
3 cloves garlic, minced
8 ounces (about 225g) mushrooms, sliced
1 teaspoon dried thyme
1 teaspoon dried rosemary
Pepper and salt to taste
1/4 cup vegetable broth
2 tablespoons nutritional yeast (optional for added flavor)
Fresh parsley for garnish (optional)