Mexican Quinoa and Sweet Potato Casserole with Chipotle Yogurt Sauce

-1 cup quinoa, uncooked and risnsed

-1 cup vegetable broth (or chicken)

-2 cans black beans, rinsed (15 oz each)

-2 cans diced tomatoes + juices (15 oz each)

-1.5 cups salsa (I used mild)

-1 tablespoon chili powder (for less spicy cut in half)

-1 teaspoon onion powder

-1 teaspoon cayenne (for less spicy cut in half)

-2 large sweet potatoes, diced

-1/2 cup Greek yogurt, I used 0% fat plain

-1 teaspoon chipotle powder

-2 teaspoons sriracha