Preheat oven to 400F (200C). Toss diced sweet potatoes with olive oil, salt, and pepper. Spread on a baking sheet and roast for 25 minutes until tender.
Heat a large skillet over medium-high heat. Add ground beef, garlic powder, salt, and pepper. Cook for 7-8 minutes, crumbling the meat, until fully browned.
Assemble the bowls by dividing the roasted sweet potatoes and cooked beef evenly among 4 serving dishes.
Top each dish with 1/4 cup cottage cheese and a quarter of the sliced avocado.
Garnish with a sprinkle of chili flakes before serving.