Heat oil of choice in a medium-large skillet on medium heat.
Place tortilla flat on a plate and sprinkle one half of it with cheese.
Sprinkle desired amount of meat, veggies and beans/legumes on top of cheese.
Sprinkle more cheese on top of meat/veggies/beans.
Fold tortilla in half.
Cook quesadilla on hot skillet for 2-3 minutes on each side. Be sure it doesn't burn!