Preheat oven to 350 degrees F.  Butter a 9 by 13-inch pan.

In a large bowl, stir together the melted butter, sugar, eggs, and vanilla until well combined.  Stir in the flour, baking powder, and baking soda.  Once a dough forms, stir in the white chocolate, cherries, cashews, and brittle.

Pour into the prepared pan, smooth into an even layer, and sprinkle with salt.  Bake 20-30 minutes until a toothpick inserted in the center comes out clean or with a few moist crumbs.

Serve warm or cool completely in the pan before cutting and serving.  Blondies may be stored in an airtight container at room temperature for up to 5 days or frozen, wrapped in parchment and foil and placed in a zipper bag for up to 3 months.  Thaw at room temperature for about an hour or the microwave for about 1 minute.