In a large bowl, cream together the butter, margarine, brown sugar, sugar, and dry pudding mix until well blended. Then beat in eggs and vanilla. Add baking soda and flour until combined.
Roll into 1 inch balls. Split each dough ball in half and flatten slightly. Place each half on the bottom and top of each mint patty and mold the dough around the mint and seal up the edges.
Place on a cookie sheet lined with parchment paper or baking mat.
Cook for about 10-12 minutes or until golden brown.
Notes
When softening your butter, it’s best to have it at room temperature. If you are in a hurry, and don’t have time to let the butter reach room temperature, slice it up into 1/4 inch slices, and microwave it for 15 seconds.This will allow the butter to soften, but not completely melt. If your butter is melted, your cookie dough will be too runny. You just need your butter to be smooth, and not lumpy.