Preheat oven to 375°. In a medium bowl, whisk together flours, baking powder, and salt.
In a large bowl, whisk together hazelnut butter, hazelnut milk, eggs, oil, cinnamon, vanilla, brown sugar, and honey until blended.
Gently fold flour mixture into wet ingredients until just combined. Divide mixture evenly among 18 paper-lined muffin cups and sprinkle 1 tsp. chopped hazelnuts over each muffin. Bake until golden and a toothpick inserted in the center of a muffin comes out clean, about 20 minutes. Cool on a wire rack.
*Hazelnut flour, milk, and butter are sold at many Whole Foods Markets and some health food stores. Other nut flours, milks, and butters, such as almond, can be substituted.
Note: Nutritional analysis is per muffin.