Sweet Potato & Beef Taco Bowls

4 medium sweet potatoes, peeled and diced
2 Tbsp olive oil
1/2 tsp cumin
1/4 tsp chili powder
1/2 tsp garlic powder
1/2 tsp smoked paprika
1/4 tsp salt
1 lb ground beef
3 Tbsp taco seasoning
15 oz can black beans, drained and rinsed
2 avocados, diced
2 cups cottage cheese

optional toppings:
pickled onions
jalapenos
cilantro
salsa

Coat sweet potatoes with oil and spices (except taco seasoning) and roast at 425 for 25-30 minutes, stirring halfway through. 

Brown the ground beef and season with the taco seasoning and about 2 Tbsp water, stirring until combined. 

Assemble the bowls with potatoes, beef, cottage cheese, avocado, and toppings.