Mix cream cheese, sugar, vanilla, and cinnamon with a hand mixer until smooth and creamy.

Spread on one half of large tortilla. Top with apple slices; fold tortilla in half.

Melt a small amount of butter on griddle. Cook quesadilla until golden brown on one side; flip and cook the other side.

Brush both sides of hot quesadilla with butter and sprinkle with cinnamon & sugar mixture.