In a small bowl, mix pecans with butter.
Lay crêpes on a counter in a single layer, pale side up. Spread each crêpe with about 2 tablespoons chutney. Thinly slice cheese, including rind, and cut into about 1-inch lengths. Distribute cheese evenly over crêpes. Gently fold each crêpe in half over filling, then in half again to make a triangle. Set filled crêpe triangles slightly apart on a 12- by 15-inch baking sheet. Lay 2 or 3 pecan halves on each crêpe.
Bake in a 400° regular oven or 375° convection oven until cheese melts and nuts are lightly toasted, 6 to 9 minutes. With a wide spatula, transfer crêpes to plates.