- Melt butter in warm pan. Add the eggs and season with salt and pepper.  
- Cook until the whites are almost set, then carefully flip the eggs.  
- Season again with salt and pepper, and let cook fully, about 30 more seconds.  
- As the eggs cook, cook sausage.  
- Toast both slices of bread.  
- Spread avocado on one side of the bread, season with salt and pepper to taste. Assemble and enjoy!