Veggies: In a large oven-safe pot, heat olive oil over medium/high. Add mushrooms. Add onion, garlic, carrots, and celery, continuing to cook until vegetables are slightly soft.
Veggies: In a large oven-safe pot, heat olive oil over medium/high. Add mushrooms. Add onion, garlic, carrots, and celery, continuing to cook until vegetables are slightly soft.