Gluten Free Vegetable stew

Name: Gluten Free Vegetable stew
Prep time: 10 min
Cook time: 55 min
Total time: 1 h 5 min
Cuisine: American
Ingredients: 1 large Russet Potato (cubed); 1 large carrot (1/2 inch sliced); 1 medium onion (diced); 4 cloves garlic (chopped); 1/2 cup green beans (trimmed & chopped 1/2 inch); 1 green bell pepper (diced); 1/2 cup sweet corn kernels (fresh, canned, or frozen); 1 cup white mushrooms (sliced); 1 tbsp dried herb de Provence (crushed); 1 tbsp sea salt; 1 tsp pepper; 3 tbsp mushroom powder; 1 tbsp plant butter; 1/4 cup olive oil or avocado oil; 4 cups water; 1 tbsp potato starch (dissolved in water)