Step 1

Preheat oven to 350°F/177°C. Line a baking sheet with parchment paper (optional).

Step 2

In a medium/large bowl, cream together the butter and brown sugar until very well combined (2-3 minutes). Mix in the sourdough discard followed by the egg yolk and vanilla extract.

Step 3

In a small bowl, whisk together the flour, baking soda and salt. Stir the dry ingredients into the wet ingredients just until the flour streaks are gone. Mix in the chocolate chips.

Step 4

Scoop cookie dough balls (about 2 tablespoons each) onto a baking sheet 2-3 inches apart. Top with extra chocolate chips (optional).

Step 5

Bake on the middle rack until the cookie edges are lightly golden (8-11 minutes).

Step 6

Recommended: scoot your cookies! Right out of the oven, place a slightly larger round object (biscuit cutter, large cup, etc.) over the cookie and scoot it around to bring the edges in, making the cookie perfectly round.Also feel free to sprinkle the cookies with flaky salt!

Step 7

Let the cookies cool on the baking sheet until they're firm enough to transfer to a cooling rack (5-10 minutes).