Preheat oven to 350 degrees. Line an 8x8 inch pan with parchment paper. Set aside.
Add the butter, vanilla, and sweetened condensed milk to a bowl. Blend together with a hand-held mixer. You are not beating these ingredients! At this point, we are basically stirring them together well.
Add the coconut and graham crumbs. With the mixer on low speed, incorporate the dry ingredients into the wet.
Transfer this mixture to the parchment lined pan. Press the mixture flat and into the corners.
Bake for 20 minutes.
While the bars are baking, unwrap the Aero bars and break them into chunks.
As soon as the bars are out of the oven, sprinkle the Aero chunks evenly over the surface. Allow the bars to sit for 5 minutes.
Use an offset spatula to evenly spread the now soft Aero Bar chunks over the top of the bars.
Allow the whole thing to cool to room temperature - at least 3 hours!
Lift the bars out using the parchment paper. Cut into 16 squares. Store in food-safe container in the fridge. Can be frozen too!