Lightly brush one side of a tortilla with canola oil and lay it brushed side down in the skillet. Layer sliced turkey, apple slices, and 1 to 2 tablespoons shredded cheddar cheese across tortilla and cook over medium-high heat.
Place second tortilla on top, brush lightly with oil
Cook for 3 minutes or until cheese begins to melt. Carefully turn the quesadilla over and cook for 3 more minutes until quesadilla is light golden brown on both sides. Repeat with remaining tortillas.
Cut quesadilla into 4 triangles. Serve warm with a dollop of sour cream, if desired