Line 2 baking sheets with parchment paper; set aside.
In a large bowl, beat butter and cream cheese at medium speed with an electric mixer until smooth. Add cake mix and strawberry extract, beating to combine. Cover, and freeze for 2 hours.
Roll cream cheese mixture into 1-inch balls, and place on prepared baking sheets. Using two forks, dip truffles into melted candy coating, gently shaking off excess. Set truffles on prepared baking sheets. Sprinkle tops with jimmies, if desired. Serve frozen. Store in freezer in an airtight container for up to 2 weeks.