Vanilla Icebox Cookies

Whisk flour and salt together in medium bowl. Using stand mixer fitted with paddle, beat butter, granulated sugar, and confectioners’ sugar on medium-high speed until fluffy, 3 to 6 minutes. Add egg yolks and vanilla and beat until combined. Reduce speed to low, slowly add flour mixture, and mix until combined. Divide dough in half, roll each half into 6-inch log, wrap logs tightly in plastic wrap, and refrigerate for at least 2 hours or up to 3 days.

Adjust oven racks to upper-middle and lower-middle positions and heat oven to 325 degrees. Spread sprinkles on parchment paper–lined rimmed baking sheet. Roll logs in sprinkles to evenly coat exterior. Line 2 baking sheets with parchment.

Slice 1 log into 1/4-inch-thick rounds; space rounds evenly on prepared sheets. Bake until edges begin to brown, 12 to 15 minutes, switching and rotating sheets halfway through baking. Let cookies cool on sheets for 3 minutes, then transfer to wire rack. Repeat with remaining log. Let cool completely before serving.