Line a 9x13 baking pan with parchment paper or plastic wrap, making sure to leave some overhang on the sides.
Break each graham cracker sheet in half so they’re now in squares, then cover the bottom of the pan with half of the graham crackers. I fit 15 squares in the bottom of mine.
In a medium mixing bowl, combine softened butter, peanut butter, granulated sugar, and brown sugar. Mix until smooth and creamy, then mix in the milk and vanilla extract.
Add the flour to a microwave safe bowl and microwave for 45-60 seconds. Sprinkle in the heat-treated flour, then mix to form a dough.
Evenly distribute the cookie dough on top of the graham crackers, then gently press down to compact the cookie dough into an even layer.
Place the remaining squares of graham crackers on top, trying your best to lightly press into the cookie dough layer without breaking them.
Lift the plastic wrap overhang up to cover the surface, then transfer to the fridge to chill for a minimum of 30 minutes.
Once chilled, slice into squares, then transfer to a baking sheet lined with parchment paper or a silicone baking mat.
In a microwave safe bowl, combine semi-sweet chocolate chips with vegetable oil. Microwave in 30 second intervals, stirring in-between, until melted and smooth.
Dip each grahamwich halfway into the melted chocolate, then return to the prepared baking sheet. Transfer to the fridge to set the chocolate before enjoying!