Creating Maple Chai Sugar Cookies with Brown Butter Frosting is simple when you follow these steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon, ginger, nutmeg, and cardamom. Set aside.
3. Cream Butter and Sugars: In a mixing bowl, beat together the softened butter, granulated sugar, and brown sugar until light and fluffy.
4. Add Egg and Maple Syrup: Add the egg, vanilla extract, and maple syrup to the butter mixture. Mix until well combined.
5. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Avoid overmixing.
6. Scoop Cookies: Using a cookie scoop or spoon, drop rounded tablespoons of dough onto the prepared baking sheet, leaving space between each cookie.
7. Bake: Bake in the preheated oven for 10-12 minutes or until the edges are lightly golden. Remove from the oven and let cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.

For the Brown Butter Frosting:

8. Brown the Butter: In a saucepan, melt the butter over medium heat. Stir frequently until it turns a golden brown color and smells nutty. Remove from heat and let cool slightly.
9. Mix Frosting Ingredients: In a mixing bowl, combine the browned butter, powdered sugar, milk, and vanilla extract. Beat until smooth and creamy, adding more milk if necessary for the desired consistency.
10. Frost the Cookies: Once the cookies are completely cool, spread a generous layer of brown butter frosting on top of each cookie.