Preheat oven to 425. In a large bowl combine cheese, chilies and onion. Mix well.

Using a pastry brush, brush a large baking sheet with melted butter. Sprinkle generously with 2 t coarse salt. Place 7-8 4″ tortillas on sheet.

Place 1 heaping tablespoon of cheese mixture on each tortilla. Spread over surface evenly.

Bake for 5 minutes or until cheese has melted. Remove from oven and fold in half, pressing sides gently together. Remove from sheet pan and let cool if serving later. Repeat until all tortillas are used. Store in refrigerator if reheating later.

If reheating, remove from fridge and let come to room temperature. Preheat oven to 350. Place quesadillas on sheet pan in a single layer. Heat for about 5 minutes. Slice in half, (I use a scissors) when removed from oven. Serve warm.