Step 1: Melt and Brown the Butter - Place butter in a saucepan over medium heat, stirring until fully melted and foaming. Continue stirring as it deepens in color for a warm, nutty aroma.

Step 2: Transfer the Browned Butter - Immediately remove from heat when amber brown bits form and pour into a large mixing bowl.

Step 3: Whisk in the Sugars - Add granulated and brown sugars to the warm butter and whisk until combined, creating a glossy mixture.

Step 4: Whisk in the Eggs and Vanilla - Incorporate room-temperature eggs and vanilla extract, whisk vigorously for about 1 minute to aerate the batter.

Step 5: Add the Dry Ingredients - Combine flour, cream of tartar, baking soda, salt, and ground cinnamon in a separate bowl, then fold into the wet batter until just mixed.

Step 6: Chill the Dough - Cover and refrigerate for about 30 minutes.

Step 7: Prepare Your Baking Sheets - Line baking sheets with parchment paper and preheat oven to 350°F.

Step 8: Mix the Cinnamon Sugar Coating - Combine granulated sugar and ground cinnamon in a small bowl.

Step 9: Scoop and Roll the Dough - Use a cookie scoop to form evenly sized balls and roll in the cinnamon sugar mixture.

Step 10: Arrange the Dough Balls - Place dough balls on the baking sheets, leaving 2 inches of space between each.

Step 11: Bake Until Golden at the Edges - Bake for 10-11 minutes until edges are lightly golden and centers are puffy.

Step 12: Let Them Rest on the Baking Sheet - Allow cookies to rest on the baking sheet for a few minutes before transferring.

Step 13: Cool on a Wire Rack - Move cookies to a wire rack to cool completely.