Preheat– set the oven to 350˚F with a rack in the upper and lower third of the oven if baking 2 sheets at a time, otherwise put a rack in the center. Line a baking sheet with parchment paper.: You will notice the warm, dry air hit the cookies as the oven comes up to temperature, which primes the surface to set quickly and hold crisp edges. I recommend placing a rack in the upper and lower third if baking two sheets at once, otherwise use the center rack to ensure even browning. A common mistake is not allowing the oven to fully preheat, which can cause uneven rise and spreading. If your oven runs hot, consider an oven thermometer to confirm the internal temperature before sliding the first tray in.
Dry ingredients– In a medium mixing bowl, whisk together flour, baking powder, and salt and set aside.: The dry mixture should smell faintly of toasted grain and be free of lumps. Whisking aerates the flour slightly and distributes the baking powder and salt , which ensures uniform lift and flavor. If you skip this step, you can get pockets of rising agent that make the cookies uneven. To troubleshoot, sift the flour and whisk again until homogenous.
Wet ingredients– Using a stand mixer with the paddle attachment or an electric mixer, beat together butter and sugar on medium-high speed until smooth and creamy, 3 minutes. To the mixture add the egg and vanilla and beat for another 1 minute to combine.: As you beat, watch the butter and granulated sugar transform from coarse to a pale, fluffy mixture that smells buttery and sweet. This creaming traps air, giving tenderness to the finished cookie. After adding the egg and vanilla , the batter should become glossy and slightly looser. Over beating after adding flour can develop gluten and produce a tougher cookie, so stop as soon as ingredients are incorporated.
Mix the batter– Reduce the mixer to low speed and add the flour mixture in 3 parts, mixing until fully incorporated. If the dough seems too sticky to roll, add 1 Tbsp flour at a time.: The dough will shift from shaggy to cohesive in stages, and stopping to scrape the bowl helps you see when everything is blended. Mixing on low protects the structure and prevents overworking the gluten. If the dough is sticky, add flour sparingly; too much will dry the dough out and make the cookies crumbly. A sticky dough that resists rolling can be chilled briefly to firm it up before continuing.
Roll out the dough– Divide the dough into 2 equal parts. You can wrap and refrigerate the dough for 30-60 minutes or proceed with rolling the dough. On a generously floured surface, roll out the dough. Dust the dough with flour if the rolling pin is sticking. Roll the dough to 1/4” thick. Periodically scoot the dough around to check that the dough is not sticking to your work surface. If it is, dust with more flour and proceed.: When rolling, the dough should glide and show a satiny sheen, and the surface will hold an even thickness of about a quarter inch. Chilling tightens the butter , making the dough easier to handle and helping cookies keep sharp edges. Work swiftly if your kitchen is warm to prevent the dough from getting too soft. If you over flour the surface, the cookies can become dry; instead, dust lightly and rotate the dough to avoid sticking.
Cut and bake– Cut cookies out with an egg-shaped cookie cutter or your favorite Easter cookie cutter. Gather your scraps and re-roll to make more cookies. Carefully transfer the cookies to a parchment-lined baking sheet – I find it helps to use a food scraper to get under and lift the cookies from the surface without squishing them. Bake at 350˚F for 10-11 minutes or until the eggs are just beginning to turn golden. Let cookies cool on the baking sheet for 5 minutes then transfer to wire racks to cool completely before decorating with icing.: As you cut and move the shapes, you will feel the dough firm slightly as it rests, and the cookies should hold their form when lifted. In the oven you will hear a faint settling and see edges take on a light golden hue, which signals doneness. Removing them too early will leave raw centers; leaving them too long will yield dry cookies. Use the five minute rest on the pan to let the cookies finish setting before moving so they do not break or warp.
Mix– In a medium mixing bowl, stir together the icing ingredients until smooth. To thicken the icing, add more powdered sugar and you can thin it out by adding more milk. Transfer to a piping bag or a zip-top bag and snip off the corner to create a hole for creating patterns on your sugar cookies. You can also use a squeeze bottle if you have one.: The icing should feel silky and pour slowly off a spoon when at flood consistency, and whisking lifts any small air bubbles for a smooth finish. Adjusting with powdered sugar or milk lets you make both outline and fill textures. If your icing gets too runny, add more powdered sugar a teaspoon at a time; if too thick, thin with a little milk . A common slip is cutting too large a hole in the bag which yields clumsy lines; start small and test on parchment.
Add color– To add color to your glaze, put some of the white icing into a small bowl and add a tiny dot of gel food coloring. To get the soft pastel colors, you can even just use some food coloring on the tip of a toothpick. A little goes a long way! If the colored icing gets too thin, you can add more powdered sugar.: Mixing color reveals how vibrant a touch of gel food coloring can be, and pastel shades appear when you dilute a dot into more icing. Stir until completely combined to avoid streaks. If you overcolor, correct by mixing in more white icing. Remember that colors often dry slightly darker, so err on the lighter side when tinting.
Decorate– Trace the cookies with icing then fill in as desired. If using sprinkles, add them right away while the icing is still wet so they cling to the icing.: When piping, the icing should flow steadily, creating clean lines that set into a glossy finish. Use a thin outline to contain the flooded icing, then fill and let set. Sprinkles added to wet icing will adhere and add crunch and color. A common error is waiting until the icing dries to add sprinkles, which prevents them from sticking; plan to sprinkle immediately after piping.