Step 1

Melt 2 teaspoons butter in a skillet over medium heat; add the eggs. Allow the egg whites to cook until mostly firm before breaking the yolks; continue cooking until eggs are completely cooked and no longer runny, 2 to 3 minutes.

Step 2

Spread one side of toasted sourdough bread slice with Dijon mustard.

Step 3

Arrange avocado slice onto the mustard.

Step 4

Top avocado with cooked eggs.

Step 5

Sprinkle Parmesan cheese over eggs.