Preheat oven to 350 degrees and prepare a baking sheet with vegetable spray or baking parchment.

In a small mixing bowl, stir together Oatie mix-up, butter, vanilla and egg yolk.

If mixture is too crumbly and doesn't hold together, stir in 1 or 2 teaspoons of water.

Stir in the chocolate chips.

Divide dough into four equal balls and place 3-4 inches apart on baking sheet.

Bake 10-12 minutes till edges are golden. Allow to cool slightly and serve warm.