Preheat your oven to 325°F and line two baking sheets with parchment paper. This lower temperature is why 4th of july shortbread cookies crowd stay pale gold instead of browning too fast—I learned this the hard way after an oven running hot ruined my first batch.

Cream the softened butter and sugar together for 2 to 3 minutes until the mixture looks almost fluffy. You want to see tiny air pockets form because that's what gives these cookies their tender structure; rushing this step means dense, heavy results every single time.

Beat in the egg one at a time, then add the milk and lemon zest. I always add the zest here because the citrus oils release slowly into the wet mixture, distributing flavor evenly throughout rather than settling in one spot.

Whisk together the flour, baking powder, salt, cinnamon, and nutmeg in a separate bowl. This is where the spice integration happens—mixing them with flour first prevents clumping when you fold everything together, which most recipes don't mention.

Fold the dry mixture into the wet ingredients with a spatula until just combined—stop the second you don't see flour streaks. Overworking develops gluten, which toughens shortbread and makes it feel more like a regular cookie than the dissolving texture you're after.

Fold in the white chocolate chips gently so they distribute throughout without breaking apart. I use a wooden spoon and turn the bowl rather than stirring hard because that keeps the chips intact.

Scoop dough onto prepared sheets with a cookie scoop, spacing them 2 inches apart. Flatten each ball slightly with the bottom of a glass—don't press hard, just enough so they look intentional.

Sprinkle red sanding sugar over the top of each cookie before baking, pressing it down just enough to adhere. Bake for 14 to 16 minutes until the edges are barely set but the centers still look slightly underbaked—this is the secret to why 4th july crowd cookies stays tender all day instead of hardening by evening.