Melt the butter.
3 tablespoons unsalted butter, melted
In a small bowl, combine the dry ingredients (flour, sugar, baking powder, baking soda, salt).
1¼ cups (156 grams or 5.5 ounces) bleached all purpose flour, 2 tablespoons light brown sugar, packed, 1 teaspoon baking powder, ¼ teaspoon baking soda, ⅛ teaspoon salt
In a mixer bowl, combine the peanut butter and eggs by hand or using a hand mixer at low speed until smooth (see note for variation involving separating eggs to create a lighter waffle).
2 eggs, ½ cup creamy peanut butter
Add the buttermilk and melted butter and mix until combined.
1¼ cup buttermilk
Add the dry ingredients and mix until just combined. Do not over-mix.
Stir in the chopped nuts.
¼ cup roasted, unsalted peanuts, chopped
Make the waffles per your waffle iron instructions.