Preheat the oven to 350 degrees F. Mist an 8-inch-square glass baking dish with nonstick cooking spray.
Whisk the flour, baking powder, baking soda and salt in a small bowl.
Beat the butter and cream cheese in a large bowl with a mixer at medium speed until fluffy. Add the brown sugar and beat 3 to 4 more minutes. Beat in the vanilla and egg. Add the flour mixture and mix on low speed until just combined. Fold in the chocolate chips, hazelnuts and coconut with a wooden spoon.
Spread the batter in the prepared baking dish and bake until a toothpick inserted into the center comes out clean, 35 to 40 minutes. Let cool 20 minutes in the dish before slicing.
Photograph by Andrew Mccaul
This recipe has been updated and may differ from what was originally published or broadcast.
Recipe courtesy of Guy Fieri