In a skillet, melt butter over medium low heat. Scramble three eggs. Set aside.
Mash the black beans slightly with a fork. Set aside.
Wipe out the pan, and increase heat to medium. Add ½ teaspoon of the oil. Place one tortilla in the skillet, and with your hand move the tortilla around in the pan in a circular motion to spread the oil.
Spread 2 tablespoons of beans evenly on the tortilla. Add 2 tablespoons of seasoned ground beef. Top with ¼ portion of the scrambled eggs. Continue layering evenly, using 2 tablespoons of rice, 2 tablespoons of salsa, and 1 teaspoon of onions. The last layer should be ¼ cup of shredded cheese, then top with another tortilla. Mash down slightly.
Cook the tortilla until the bottom is lightly browned. Carefully flip the quesadilla with a spatula, and continue to cook until the other side is lightly browned and the cheese is melted.
Repeat the process with the remaining ingredients.
Allow to cool slightly, cut into quarters and serve with your favorite toppings.