11. learn how to make grandma's mint brownies June 25, 2014 I finally did it! I made grandma's mint brownies and they were delicious! I really wanted to sit with her and learn step by step. Unfortunately it was a busy busy week and i had to get them done for the family reunion so I had to just fit them in late one night. I need some more practice on the frosting presentation but the flavor was spot on! I can't wait to make them again!