In a saucepan over medium heat, melt the butter until it turns golden brown and has a nutty aroma, about 5 minutes. Remove from heat and let cool slightly.

In a mixing bowl, whisk together the flour, baking soda, cinnamon, and salt. Set aside.

In another bowl, combine the brown butter, brown sugar, and granulated sugar. Whisk until smooth. Add the eggs and vanilla, mixing until well combined.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper. Scoop tablespoon-sized balls of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Bake for 10-12 minutes or until the edges are golden brown. Let cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.