Heat a skillet over medium. Melt butter, add pineapple, brown sugar, and cinnamon. Cook 4 to 5 minutes until edges brown.

Lay a tortilla flat. Arrange brie on half, add pineapple (and chicken if using), fold over.

Wipe skillet, lower to medium-low. Cook quesadilla 2 to 3 minutes per side until cheese melts and tortilla is golden. Press gently with a spatula.

Cut into wedges and serve warm. Watch the counter. My dog learns fast.