01 -
Heat the oven to 350°F. Grease a 12-cup muffin tin very well with cooking spray or softened butter.
02 -
Cook the sausage in a skillet over medium heat, breaking it into small crumbles, until browned and cooked through. Drain well and cool for a few minutes.
03 -
Divide the bread cubes, sausage, cheddar, green onions, and bell pepper evenly among the prepared muffin cups.
04 -
Whisk the eggs, milk, mustard powder, salt, and pepper in a large measuring cup until smooth.
05 -
Pour the egg mixture into the muffin cups, filling each just below the rim. Bake for 18-22 minutes, until puffed and set in the center.
06 -
Let the muffins cool in the pan for 5 minutes. Run a thin spatula around the edges, lift out, and serve warm.