Preheat your oven to 375°F (190°C). Line a baking sheet with parchment paper. This prevents sticking and helps cookies bake evenly. Preparing the tray first keeps baking smooth and stress free.

Place softened butter and sugar in a large bowl. Beat them together until light and fluffy. This step takes about three minutes. Creaming well creates soft cookies with a delicate texture.

Add the eggs one at a time. Mix well after each egg. Scrape the sides of the bowl if needed. The dough should look smooth, creamy, and slightly thick.

In another bowl, combine flour, cream of tartar, baking soda, and salt. Stir everything together until evenly mixed. This step spreads the leavening ingredients evenly through the dough.

Slowly add the dry ingredients into the butter mixture. Mix gently until a soft dough forms. Do not overmix. Overmixing can make cookies dense instead of soft.

In a small bowl, mix the sugar and cinnamon together. Stir until the color becomes evenly brown. This mixture gives snickerdoodles their famous sweet cinnamon coating.

Use a cookie scoop or tablespoon to scoop dough. Roll it gently between your hands. Make smooth balls about one inch wide. This helps cookies bake evenly.

Roll each dough ball in the cinnamon sugar mixture. Coat it well on all sides. The sugar layer creates that classic crackly top during baking.

Place the coated dough balls on the prepared baking sheet. Leave about two inches between each cookie. The cookies spread slightly while baking.

Bake the cookies for about 9–10 minutes. The edges should look set. The centers will still look soft. That is perfect for chewy snickerdoodles.

Let cookies cool on the baking sheet for five minutes. Then move them to a cooling rack. This step helps them finish setting while staying soft.