Brown the Butter: In a saucepan over medium heat, melt the unsalted butter, stirring frequently. Cook until it turns golden brown and emits a nutty aroma. Remove from heat and cool slightly.
Prepare the Cupcake Batter: In a large bowl, combine the granulated sugar with the browned butter and whisk until mixed. Add the eggs and milk, beating until fully combined.
Combine Dry Ingredients: In a separate bowl, whisk together flour, baking powder, and chai spice mix.
Mix Wet and Dry: Gradually add the dry mixture to the wet ingredients, stirring gently until just combined. Avoid overmixing.
Fill Cupcake Liners: Line a cupcake tin with liners and fill each two-thirds full with batter.
Bake: Preheat the oven to 350°F (175°C) and bake for 18-20 minutes or until a toothpick comes out clean.
Cool: Allow the cupcakes to cool completely on a wire rack before frosting.
Make the Spiced Frosting: Beat together unsalted butter and powdered sugar until fluffy. Add milk and desired spice mix until smooth.
Frost the Cupcakes: Use a piping bag or knife to frost the cooled cupcakes with the spiced frosting.