Heat a large sauté pan over medium heat and add 3 tablespoons of olive oil.
Once the oil is heated, add the chopped red onion to the pan.
Sauté the onion until it becomes soft and translucent, which usually takes about 5 minutes.
Next, add 4 minced garlic cloves to the pan and cook for an additional 1 minute, stirring continuously.
Stir in ⅓ cup of minced chipotle peppers in adobo sauce along with the diced vine-ripened tomatoes.
Cook the mixture until most of the liquid from the tomatoes has evaporated and the mixture has thickened. Stir often during this process, which typically takes approximately 20 minutes.
Once the mixture has thickened, add 3 thinly sliced scallions, 2 tablespoons of honey or maple syrup, 1 teaspoon of salt, 1 teaspoon of pepper, and ½ cup of chopped cilantro to the pan.
Finally, add 2½ cups of cooked shredded chicken to the pan and mix well to combine all the ingredients. Keep the mixture warm while you prepare the quesadillas.