Assemble these quesadillas on a large cookie sheet. The cookie sheet is convenient for transporting them to the grill. Use a broad pancake turner to turn the quesadillas.
Assemble the quesadillas up to one hour in advance. Slide them into resealable food-storage plastic bags until you are ready to grill.
To add more color and nutrients to these versatile quesadillas, add diced fresh vegetables or a scattering of leftover vegetables with the pepper and tomato.