Mole Poblano Mushroom Wellington

Ingredients

• 1 tablespoon vegetable oil
• 1 pound cremini mushrooms, chopped
• 1 large yellow onion, chopped
• 3 garlic cloves, minced
• 1 cup walnuts, chopped
• 3 tablespoons Hernan Mole Poblano
• 1 1/2 cups vegetable broth
• 1 bag (6 oz) baby spinach
• 1 package puff pastry, defrosted
• 1/4 cup plant milk