One giant monster cookie loaded with peanut butter, oats, chocolate, and m&m's. This is a fun way to celebrate the first day of school.
In a large bowl (or bowl of a stand mixer) cream together the butter, brown sugar, and peanut butter until light and fluffy, about 3-4 minutes. Mix in the egg and vanilla, scraping down the sides of the bowl as needed.
In a separate bowl, add the flour, baking soda, cornstarch, and salt and whisk to combine. Add the flour mixture to the wet ingredients and mix until just combined.
Cook for 16-20 minutes or until lightly golden brown. It will cook more as it cools so you don't want to overcook it. Mine is done at 16 minutes. Remove from oven and let cool completely on a cooling rack.
I found my tart pan on amazon.
You will find the mini m&m's in the candy aisle and also sometimes with the chocolate chips.
I have made this with and without the frosting. Both ways are yummy. With the frosting it's sweet, so keep that in mind if you are sensitive to sweetness.