Cook your steak(s) to your liking, When making quesadillas I cook to just under medium.

Choose to grill your steaks or pan fry. Be sure to season them well first. Allow steaks to rest before slicing.

Saute your peppers and onions in butter, season well with salt and pepper as they cook.

When ready to make quesadillas. Set up your ingredients in the line of order you will be adding them to the tortilla. It's efficient that way.

Spray waffle iron with Pam or whatever you use and heat it until hot/ready.

Once iron is ready, lay one tortilla on the griddle then sprinkle cheese, add beans, peppers & onions, steak slices and then add some more cheese (the same as you first did or mix it up with a second variety of cheese as suggested...no rules here). Top with the another tortilla gently close the waffle iron putting more and more pressure in it. Hold it closed for 30 seconds, pressing down where cool. Allow it to continue cooking another 3-3 ½ minutes or so, putting pressure on it every now and again. Once the tortilla looks done to your liking (with some brown or crisp edges/spots, get under it with a small metal spatula or butter knife and spatula and place it on a cutting board for a minute or two. Use a sharp chefs knife to cut it into 4 triangles right along the waffle marks. Don't "saw" it into quarters, press and roll your chefs knife to make a clean cut. Serve with salsa and repeat until full.