Step 1: Make the Dough

1. In a large bowl, cream together butter, granulated sugar, and brown sugar until fluffy (about 2 minutes).
2. Mix in apple butter, egg, and vanilla extract, stirring until smooth.
3. In another bowl, whisk together flour, baking soda, cream of tartar, salt, cinnamon, and nutmeg.
4. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Step 2: Chill the Dough

1. Cover the dough and refrigerate for 30-60 minutes (this helps the cookies stay thick and chewy).

Step 3: Preheat & Coat the Dough Balls

1. Preheat oven to 350°F (175°C). Line baking sheets with parchment paper.
2. In a small bowl, mix cinnamon and sugar for coating.
3. Roll the chilled dough into 1 ½-inch balls, then roll each in the cinnamon-sugar mixture.

Step 4: Bake the Cookies

1. Place the coated dough balls 2 inches apart on the baking sheet.
2. Bake for 10-12 minutes, until the edges are set but the centers look slightly soft.
3. Let cookies cool on the baking sheet for 5 minutes, then transfer to a wire rack.