Melt 1 stick butter in small bowl in microwave or on stove top. Remelt as needed to keep very liquidy and warm, continue melting more as needed.
Beat 4-5 eggs and add cheese slowly until you have a nice thick consistency like oatmeal, with no egg dripping off wet. Make more as needed. When I used 1.5 lbs muenster, I needed 9 eggs
Lay filo dough down and cut into pieces about 5-6 inches x 10 inches. A bit smaller is ok. Cover with plastic wrap and a wet kitchen towel to prevent drying out.
Take one sheet of the cut filo, brush with butter. Fold the edges in so you've folded it into 1/3 the width (1/3 of the 5-6“) as it was before. You can do a bit less so that the edges don't meet and your triangle is a bit bigger. Brush with butter again. Add a spoonful of cheese mixture. Fold down to make a triangle, then keep folding up the 10 inches. Brush last piece with butter to hold it neatly
Freeze in airtight container. When ready to bake, 15-20 min at 350F until lightly browned and crispy