You can create a delicious quinoa and black bean salad by mixing your leftover quinoa, black beans, and diced tomatoes with some lime juice, cilantro, and avocado. This dish is fresh and filling, providing about 350 calories per serving. You can also sauté the mixture with some onions and bell peppers to make a warm quinoa burrito bowl, which would be around 400 calories. Top with a dollop of Greek yogurt for extra creaminess and protein.