Step 1

Make the cookies: Heat the oven to 350 degrees. Line two large baking sheets with parchment paper.

Step 2

Combine the butter and sugar until well blended and light. Add the egg yolks, vanilla, and salt, and beat to combine. Scrape down the bowl and beaters. Add the flour, and mix just until the flour disappears. Fit a piping bag with a medium (approximately 1/2-inch opening) French star tip [I’ve got the Ateco 866 but others will work], or you can use a large plastic bag with the corner snipped off.

Step 3

Pipe the dough into about 1/2-inch-wide, 1 3/4-to-2-inch-long segments, spaced about 1 inch apart, on your baking sheets. It’s possible a professional would have a better way to do this, but since I am not a professional, I use a knife or scissors and simply snip off the dough for each cookie, giving it a clean finish. Bake the cookies for 11 to 13 minutes, or until they are golden at the edges.

Step 4

You can cool these completely on the baking trays, or for at least 2 minutes, to make them easier to lift to a cooling rack. Let the cookies cool completely. Repeat with the remaining dough.

Step 5

Assemble: Meanwhile, place your jam in a sandwich bag, but don’t snip off the corner until you’re going to need it, to limit messes. Place the sprinkles on plates with rims or in shallow bowls. Melt the chocolate chips in the microwave or in a small saucepan until they’re three-quarters melted, then stir to melt the rest. (This will keep the chocolate from burning or overheating.) Place the melted chocolate in a bowl with a good depth for dipping. Line two large baking sheets with parchment, or just use the cookie trays you baked on, wiping off any excess crumbs.

Step 6

Once the cookies are completely cool, flip half of them over, to become the bottom half of your sandwiches. Snip a little corner off your jam bag, and squeeze a little down the center of each flipped cookie, but not so much that it will squeeze out when sandwiched. Sandwich with the other half of the cookies. Dip each a third to half of the way into the chocolate and (trust me) let it drip off, wiping away any excess. (I know we all love chocolate, but the sprinkles will slide off if it’s too thick.) Roll the cookies in sprinkles, then return them to the baking sheets to set. You can pop them in the freezer for 5 minutes to hasten this process along.

Step 7

Do ahead: These keep at room temperature in an airtight container for a week.