In a medium bowl, whisk together the flour, baking soda, and salt. Set aside.

In a large mixing bowl, whisk together the melted butter and sugar. It will be very liquid.

Then vigorously whisk in the egg and egg yolk (about 1 minute of whisking) followed by the vanilla.

Switch to a rubber spatula and dump in the dry ingredients. Gently mix and fold the dough to fully combine.

When the dough is smooth and combined, plop in spoonfuls of preserves throughout the bowl of dough.

Using the rubber spatula, gently fold the dough 3-4 times max. Fold just enough to disperse ribbons of strawberry throughout the dough but not too much to where the preserves fully mix in.

With a large 2 oz cookie scoop (aka ice cream scoop), scoop up the dough in one swift motion and plop onto a plate or small pan lined with parchment paper. When scooping, pay attention to where the jam is at. Try to include most of the jam at the bottom of the scoop so that when it’s turned out, you’re left with a thick ribbon of jam on top of each cookie dough ball.