Preheat oven to 350F/180C.

Spread butter onto each tortilla, like you are buttering toast. Alternatively, melt the butter and brush onto tortillas.

Sprinkle generously with cinnamon sugar.

Stack the tortillas, then cut into strips, or triangles.

Spread in a single layer on a baking tray (3 tortillas should almost perfectly fit).

Bake for 5 to 8 minutes until golden and crisp.

Eat warm or at room temperature.