You can use 1 1/2 cups of any one color of bell pepper if you like.
Free up valuable oven space right before a party by microwaving these nachos instead. Assemble nachos as directed (without foil) on a microwavable plate. Microwave uncovered on High 5 to 6 minutes, rotating plate every 2 minutes, until cheese is melted. Spoon salsa mixture over nachos.