1For the Bean Layer: Combine the drained and rinsed black beans, pinto beans, and cannellini beans with minced garlic, olive oil, smoked paprika, cumin, chili powder, cayenne pepper (optional), and the juice of 1 lime. Season with salt and pepper to taste.
2For the Layers: Layer the bean mixture with Greek yogurt, mashed avocado, diced tomatoes, cilantro, shredded cheddar cheese, sliced black olives, and diced red onions.