In a large bowl, stir together the rolled oats and rice crispy cereal.
In a small pot, melt the peanut butter, maple syrup and brown sugar until combined. Pour in vanilla and stir. You can also do this in the microwave.
Pour over the dry ingredients and stir until combined. Fold in the chocolate chips.
Scatter over a lined baking sheet. Bake for 3 to 5 minutes, then toss. Bake for an additional 5 minutes until crispy. Remove from the oven and allow to cool. Store in a jar in the pantry for up to 7 days.