01 -
Beat butter, shortening, peanut butter, and both sugars until light and fluffy (about 2 minutes). Mix in eggs one at a time, then stir in vanilla.
02 -
Mix flour, baking soda, and salt in a separate bowl. Combine with wet ingredients until just mixed - avoid overmixing.
03 -
Heat oven to 375°F. Roll dough into 1/2 inch balls, coat in sugar, and place on ungreased baking sheet. Bake 6-8 minutes until set but not brown.
04 -
Let cookies rest on baking sheet for 2-3 minutes, then move to cooling rack.
05 -
Heat butter, cocoa, and milk until boiling. Remove from heat, add powdered sugar and vanilla, beat until smooth.
06 -
Spread or pipe frosting between two cookies to make sandwiches.