Relleno vegetariano con corteza Banza

Ingredients

• 1 box Banza pizza crusts (2 crusts)
• 6 tbsp unsalted butter, divided
• 1 yellow onion, cut into .25” pieces
• 4 stalks celery, cut into .25” pieces
• 2 large carrots, cut into .25” pieces
• 1 sweet potato, peeled and cut into .25” pieces
• 2 cups vegetable broth
• 2 tbsp herbs (rosemary, sage, and/or thyme), finely chopped