Cook sausage in a frying pan until its done, typically about 10 or 12 minutes until browned. Drain grease in container, and place the on a plate with paper towels to further drain.
Allow the pan to cool then cook scrambled eggs. For the ideal scrambled egg, start the eggs at a room temperature then cook the egg as the pan heats up to medium heat, stirring frequently. As the eggs begin to firm, season with salt and pepper. Remove the eggs onto the second plate, and then clean the pan.
Heat ½ Tablespoon of butter in the pan. Once the butter has melted, place a flour tortilla. Add eggs and then sausage to one have of the tortilla. Top with cheese and any other ingredients you want to include, such as salsa, hot sauce or onions (such as feta pictured here).
Fold the empty side of the tortilla onto the side with the sausage and eggs.
Cook the folded stuffed tortilla until golden brown, about 2 minutes, then carefully flip to cook the second side. Once the second side has become golden brown, remove the sausage, egg and cheese quesadilla to a serving plate and repeat the process for the remaining three tortillas.