Melt butter in a pot over medium heat until it turns an amber color.

Remove from heat and let cool.

In a large mixing bowl, whisk together flour, baking powder, salt, allspice, cinnamon, and brown sugar.

In another bowl, whisk together milk, eggs, and cooled brown butter.

Pour wet ingredients into dry ingredients and stir until just combined.

Preheat waffle iron and oven to 200 F.

Scoop batter into waffle iron and cook according to waffle iron directions.

Transfer cooked waffle to a tray in the oven to keep warm.

Repeat with remaining batter.

Dust with powdered sugar, drizzle with maple syrup, and sprinkle with toasted walnuts (optional).

Serve and enjoy!