Preheat the oven to 350°F. Line two sheet pans with parchment paper.
Cream the butter with the granulated sugar and brown sugar until light and aerated.
8 oz unsalted butter, 4 oz granulated sugar, 8 oz brown sugar
Add the eggs and vanilla and mix until combined.
2 large eggs, 1 tablespoon vanilla extract
Add the flour, sourdough powder, baking soda and salt, mix to combine. Add the mini chocolate chips and mix until combined.
10 oz all-purpose flour, 4 oz sourdough powder, 1 teaspoon baking soda, 1 teaspoon salt, 10 oz mini chocolate chips
Use a small scoop or tablespoon to scoop the dough into balls. Set the cookie-dough balls onto the prepared pans, leaving 2" between the cookies.
Bake until the edges of the cookies are beginning the brown and the center is still soft, about 7-8 minutes. Flip and trays half way through baking to help them bake evenly.
Cool on the pan about 5 minutes until firm enough to transfer to a wire rack to finish cooling.
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Notes
If measuring the flour by volume use the “dip & sweep” method. That is, dip the measuring cup into the flour bin, overfill it, then sweep away the excess.