Savory gluten free and vegan casserole with yellow squash, leeks, red onions, red bell peppers and garlic. It’s seasoned with parsley, basil and thyme, balsamic vinegar and olive oil. Quick, easy, economical and delicious! This casserole is perfect for holiday dinners when you’re looking for lighter fare to go along with all the heavy dishes. Healthy, low calorie, clean eating.