Healthy Creamy Mushroom Soup

Ingredients

• 1 head of cauliflower, sliced into pieces
• 1 tsp olive oil
• 1 shallot, sliced
• 12 oz brown cremini mushrooms, sliced
• 4 oz shiitake mushrooms, sliced
• 3 garlic cloves, crushed
• 1 tbsp fresh thyme
• 4 cups chicken broth
• 1/3 cup plain non-fat Greek yogurt