Combine cream cheese, shredded cheese, tomato, red pepper and cilantro in a large bowl.
Spread filling evenly over 4 tortillas, top with chicken and then top with remaining tortillas.
Brush with oil and cook quesadillas in a non-stick skillet over medium-low heat, turning once until browned on both sides and filling is hot. Alternatively, use a handy kitchen appliance like a panini maker (which is what I did, no oil needed this way!)
Cut into wedges and serve with a side of salsa or guacamole, if desired.
Recipe by Feisty Frugal & Fabulous at https://feistyfrugalandfabulous.com/2014/03/easy-cheesy-chicken-quesadillas/