Step 1: Melt butter in a light-colored saucepan over medium heat, stirring until golden brown flecks form and it smells nutty. Pour into a bowl and cool 15 minutes.

Step 2: Whisk browned butter with brown sugar and granulated sugar. Add egg and vanilla; whisk until smooth.

Step 3: Mix flour, cardamom, baking soda and salt in a second bowl. Fold into the wet mixture until no dry streaks remain. Chill dough for 30 minutes.

Step 4: Heat oven to 350°F (175°C). Mix rolling sugar and cardamom. Scoop 1 1/2-tablespoon portions, roll in spiced sugar and arrange 2 inches apart on lined trays.

Step 5: Bake 10–12 minutes until edges are set but centers remain slightly soft. Cool 5 minutes on trays, then move to a rack.

Tip: Use a light-colored pan so the butter solids are easy to see.