Plain, basic quesadillas get a flavor and nutrition upgrade in this rustic version that includes pumpkin or calabaza, onion, corn kernels and poblano chile peppers. The savory pumpkin mixture can be made a couple of days ahead and just reheated when you are assembling the quesadillas. Once you've tried these, you'll wish you had made a double batch of the pumpkin and veggies medley in order to have some scrumptious leftovers to use later in the week as a side dish or ingredient in other mexican-inspired fare (see ideas for various uses below the recipe).