In a medium bowl, whisk together the all-purpose flour, baking soda, cream of tartar, Earl Grey tea leaves, ground cinnamon, and salt until well combined.

Mix Wet Ingredients

In a large bowl, cream the softened butter, granulated sugar, and brown sugar together until light and fluffy. Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract and orange zest.

Combine Ingredients

Combine Mixtures

Gradually add the dry ingredients to the wet mixture, mixing until just combined. Be careful not to overmix.

Coating and Baking

Prepare Coating

In a small bowl, mix together the granulated sugar, ground cinnamon, and lemon zest for the coating.

Shape Cookies

Using a cookie scoop or tablespoon, scoop out dough and roll into balls. Roll each ball in the coating mixture until fully coated.

Bake

Place the cookie dough balls on the prepared baking sheet, spacing them about 2 inches apart. Bake in the preheated oven for 10-12 minutes, or until the edges are lightly golden.

Cool and Serve

Allow the cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.