Slow Cooker Sweet Potato Chili

2 large sweet potatoes

cut into 1-inch cubes

1 (28 ounce) can crushed tomatoes

1 (14 ounce) can diced tomatoes

1 (15 ounce) can kidney beans

1 (15 ounce) can black beans

1 onion

chopped

2 tablespoons chili powder

1 tablespoon ground cumin

1 tablespoon brown sugar

2 cloves garlic

minced

2 teaspoons smoked paprika

½ teaspoon salt