Prep: Put a 9x13-inch pan with 4 cups of hot water on the lower oven rack and heat the oven to 300°F (150°C). Grease a 12-cup muffin tin.
Blend: Blend the eggs, cottage cheese, Gruyère, salt, pepper, and garlic powder for 30 to 45 seconds until completely smooth.
Fill: Divide the bacon, spinach, and peppers among the cups, pour in the egg mixture until three-quarters full, and top with green onion.
Bake: Bake on the center rack above the water bath for 25 to 30 minutes, until just set (160°F / 71°C in the center).
Rest: Cool 5 minutes, loosen with a thin spatula, and serve.