1Heat a non-stick skillet over medium heat. Add onion and garlic; cook and stir until softened and translucent, 8 to 10 minutes.
2Combine black beans with cooked onion and garlic in a bowl. Place tortilla bowls into serving bowls; spoon bean mixture into tortilla bowls.
3Heat non-stick skillet over medium-low heat; crack eggs onto skillet and cook to desired doneness, about 4 minutes for medium. Place eggs on black bean mixture; sprinkle with Cheddar cheese.
4Cook each bowl in the microwave until cheese is melted, 30 to 45 seconds. Top with avocado and sour cream.
Footnotes
Tip
Parchment can be used for easier cleanup/removal from the pan.