Preheat oven to 400 ºF. Spray 9 x 13 dish with olive oil.
Mix together rotisserie chicken, refried beans, salsa and taco seasoning.
Lay out tortilla and place generous amount of mixture in the center of each tortilla. Roll up and place in 9 x 13 dish. Repeat with all 8 tortillas.
Add olive oil and flour to small sauce pan and heat over medium heat for about a minute. Whisk in chicken broth and Rotel and bring to a gentle boil.
Turn off heat and mix ¼ cup of the liquid with greek yogurt in a small mixing bowl (this will temper the greek yogurt and prevent it from curdling). Then add the greek yogurt to the rest of the chicken broth.
Add 1 cup of Mexican cheese to the sauce pan and mix together.
Pour cheese sauce over the enchiladas. Sprinkle Mexican cheese on top, and bake for 20 minutes.