Choc Chip Skillet Cookie

• 1 cup plain rolled oats
• 1.5 cup self-raising whole-wheat flour
• .5 cup peanut butter
• 75 g butter, melted
• .3 cup maple syrup
• .3 cup milk
• 2 eggs, lightly beaten
• 2 tsp vanilla extract
• 1 cup dark choc chips