Prep your situation. Preheat your oven to 350°F and line a large baking sheet with parchment paper. Set out two small dishes—one with granulated sugar, one with holiday sprinkles. Unwrap your Hershey's kisses now because future you will thank current you.
Mix the dry stuff. In a medium bowl, whisk together the flour, baking soda, and salt. Set it aside and feel accomplished.
Cream the butter and sugar. In a large mixing bowl with a hand or stand mixer (paddle attachment if you're fancy), beat the butter and both sugars until light and fluffy. This takes about 2-3 minutes and is weirdly satisfying.
Add the wet ingredients. Mix in the eggs and vanilla until everything's smooth and combined.
Bring it together. Pour in half the dry ingredients and mix. Add the other half and mix until combined. The dough will look thick and crumbly at first—keep mixing, it'll come together. This is normal. You're doing great.
The great divide. Evenly divide the dough between four bowls. If you're a precision person, each portion should weigh about 245g. If you're more of a "close enough" person, just eyeball it into four roughly equal amounts.
Create your variations. Add the respective ingredients to each bowl: peanut butter mix-ins to one, chocolate to another, sugar cookie additions to the third, and gingerbread spices to the fourth. Using a regular spoon (not a mixer), stir each dough until well combined. Some will be easier than others—just commit to the stirring.
Shape and coat. Scoop out the cookie dough onto a large plate. For peanut butter cookies, use a heaping tablespoon. For the others, use a level tablespoon. Roll each ball smooth between your hands, then coat in their respective coatings. Pro tip: if sprinkles won't stick to the sugar cookies, dampen your hands slightly before rolling.
Bake time. Place the cookie dough balls on your prepared baking sheet, spacing them about 2.5 inches apart. Bake for 8-10 minutes. They should look set but still slightly soft in the center.
The kiss press. The second those cookies come out of the oven, immediately press a kiss into the center of each one. The peanut butter ones should crack beautifully when you press—that's exactly what we want. Mix up chocolate and peppermint kisses for maximum festive vibes.
Cool and repeat. Transfer the cookies to a cooling rack and bake the rest of your batch. Try not to eat them all while they're still warm. (I won't judge if you do.)