In a small bowl, whisk the flour, baking powder, salt, and baking soda together. Set aside.
1 ¾ cups (259g) flour*, ½ teaspoon baking powder, ½ teaspoon fine sea salt, ¼ teaspoon baking soda
Using a hand mixer or a stand mixer fitted with the paddle attachment, cream the butter with both sugars until smooth. Mix in the egg and vanilla extract.
¾ cup (170g) unsalted butter, ½ cup (100g) granulated sugar, ¼ cup (50g) light brown sugar, 1 egg*, ½ teaspoon vanilla extract
Add the dry ingredients into the wet ingredients and mix on low speed until cookie dough forms. Fold in the chocolate chips and sprinkles. Cover and chill dough for at least 30 minutes.
½ cup (56g) semisweet chocolate chips, ⅓ cup Halloween sprinkles*
Preheat oven to 350°F. Line a baking sheet with parchment paper. Arrange scoops of cookie dough on prepared baking sheet, 1-2 inches apart. Bake for 8-10 minutes. Immediately after removing the cookies from the oven, press candy eyeballs on top of each cookie. Allow the cookies to cool on baking sheet at least 10 minutes before transferring to a wire cooling rack.
candy eyeballs
Notes
I use Bob's Red Mill 1 to 1 flour for gluten free cookies. If you are not looking to make these gluten free, use any AP flour.
For eggless cookies, I recommend Bob's Red Mill Egg Replacer. You will need 1 tablespoon of egg replacer mixed with 2 tablespoons of water. Once mixed with water, the egg replacer must sit for just a few minutes to thicken.
While any sprinkles will work, I recommend jimmies or fun shapes (like bats or ghosts). Nonpareils may be used, but might bleed into your dough a bit.