Heat oven to 300°F. Boil water for the baking water bath.
Grease a 12-cup muffin pan. Set it inside a larger roasting pan.
Blend eggs, cottage cheese, shredded cheese, salt, pepper, and hot sauce until smooth and airy.
Divide bacon and bell pepper among muffin cups. Sprinkle with green onion.
Pour egg mixture into cups, filling each about three-quarters full.
Slide pans into the oven. Pour hot water into roasting pan halfway up muffin pan sides.
Bake until just set with a slight jiggle, 23–28 minutes.
Rest 5 minutes. Loosen edges and lift out. Serve warm.