Combine all cookie ingredients in a mixing bowl and stir until smooth.
Bake at 350 for 7-8 minutes.
Allow to cool.
While cookies are cooling, place filling ingredients in a bowl and mix with a hand mixer or standing mixer until mixture thickens and is evenly combined.
Place a dollop of filling on one cookie (flat site) and press a second cookie (flat side) on top.
Place cookie sandwiches in a single layer in an airtight container in the refrigerator for up to 7 days.