In a mixing bowl add the milk, honey and peanut butter and stir with a whisk. If mixing is difficult, you can slightly warm the mixture in a microwave or in a bain-marie (water bath).
Add the rest of the ingredients to the mixture, keeping some chocolate chips for the surface. Mix well and pour the mixture into a buttered square baking dish.
Add the chocolate chips on top and bake for 35-40 minutes.