For a vegan option, substitute the feta cheese with a plant-based feta alternative or omit it entirely. Add a sprinkle of vegan parmesan cheese before baking for extra flavor. Feel free to experiment with different types of beans, such as kidney beans or black beans, to customize the flavor profile. A dash of smoked paprika or a pinch of red pepper flakes can add a delightful smoky or spicy kick to the stuffing. To prevent the peppers from drying out during baking, you can add a tablespoon or two of water to the bottom of the baking sheet.