Rhubarb Jam Pinwheel Cookies

• 16 tablespoons unsalted butter, softened
• 1 cup light brown sugar
• 1

Beat butter in the bowl of a stand-up electric mixer until creamy; add sugars, and beat until light and fluffy. Add eggs and vanilla, and beat until blended. Add flour, baking soda, and salt; mix until combined.

Place half of the dough between sheets of wax paper, and roll into a 12x10-inch rectangle, ¼-inch thick. Remove top sheet of wax paper, and spread top of dough with ½ cup jam. R