In a mixing bowl, measure the flour, baking powder, and salt. Whisk to blend the dry ingredients well.
1½ cups all purpose flour, 1½ teaspoon baking powder, ¼ teaspoon salt
Measure the sugar and butter in a large mixing bowl. Using a hand mixer, cream the butter and sugar. Add the egg and the vanilla extract and mix in until fully blended.
½ cup unsalted butter, ¾ cup granulated white sugar, 1 egg, 1 teaspoon vanilla
Add the dry ingredients in two or three portions to the bowl of wet ingredients. Use the mixer to blend after each addition.
¼ cup Halloween jimmies
Scrape sides with a spatula and mix all the flour in. Add some sprinkle jimmies to the dough and mix in using a spatula.
Pour some Halloween sprinkles into a shallow bowl. Scoop the cookie dough out and form 20 balls. Press the cookie balls to flatten them slightly, and press one side down in the bowl of Halloween sprinkles.
½ cup Halloween Sprinkles
Set the decorated cookie on the parchment lined cookie sheet. Press in any candy eyes.
60 mini candy eyes
Repeat with all the cookie balls, ten cookies per cookie sheet. Set in the refrigerator for 40 minutes, or the freezer for 20 minutes.
Preheat your oven to 350 F and line two large cookie sheets with parchment paper or a Silpat mat. Set them aside while cookies are chilling.
Bake at 350 F for 12 to 13 minutes or until lightly browned. The center will still appear soft, but will firm up while cooling.
Remove from oven and cool for 5 minutes before transferring to a wire cooling rack.