📖 Instructions

1. Before you do anything else, preheat your oven to 375°F (190°C). This is important because you want a nice hot oven waiting for your cookies. Also, line two baking sheets with parchment paper or silicone baking mats. Trust me, it makes cleanup a breeze and helps with even baking.
2. In a small, shallow bowl, whisk together the coating ingredients: the granulated sugar and ground cinnamon. Set this aside because you'll be rolling your cookie dough in this delicious mix later.
3. Now, in a large mixing bowl or the bowl of a stand mixer fitted with the paddle attachment, cream together the softened butter, granulated sugar, and brown sugar. Beat them on medium speed until the mixture is light and fluffy. This should take about 2-3 minutes. Make sure your butter is truly softened, not melted, otherwise, your cookies might spread too much.
4. Next, beat in the eggs one at a time, incorporating each fully before adding the next. Then, stir in the vanilla extract. Scrape down the sides of the bowl with a rubber spatula to ensure everything is well combined. Don't overmix here, just until everything comes together.
5. In a separate medium bowl, whisk together your dry ingredients: the all-purpose flour, cream of tartar, baking soda, and salt. Whisk them really well to get rid of any lumps and ensure the leavening agents are evenly distributed.
6. Gradually add the dry ingredient mixture to the wet ingredients, mixing on low speed until *just* combined. Stop as soon as you no longer see streaks of flour. Overmixing develops too much gluten, which can lead to tough cookies, and nobody wants that!
7. Now for the fun part! Scoop out the dough using a small cookie scoop (about 1.5 tablespoons) or by rolling a generous tablespoon of dough between your palms to form a ball. Make sure they're roughly the same size for even baking.
8. Roll each dough ball generously in the cinnamon-sugar mixture you prepared earlier. You want a good, thick coating all around! Place the coated dough balls about 2 inches apart on your prepared baking sheets. They will spread a bit.
9. Bake for 9-11 minutes, or until the edges are set and lightly golden, but the centers still look soft and slightly underbaked. This is the secret to a chewy snickerdoodle! If you bake them until they're fully firm, they'll be hard once cooled. They might look a little puffy when you pull them out, but they'll settle.
10. Remove the baking sheets from the oven and let the cookies cool on the sheets for about 5 minutes. This allows them to finish setting up without breaking. Then, carefully transfer them to a wire rack to cool completely. Or, if you're like me, snatch one or two while they're still gloriously warm! Enjoy your delightful, perfectly spiced snickerdoodles!