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Preheat oven to 350F. Line an 8 x 8 baking pan with parchment or aluminum foil. Spray with oil.
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Combine flour, baking powder, and salt. Set aside.
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Beat butter and brown sugar together until combined. Add egg and vanilla; mix well. Pour flour mixture into butter mixture and stir until just combined. Use a spatula to gently fold in white chocolate chips, walnuts, and coconut. Pour mixture into the prepared pan.
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Bake for 20 – 24 minutes or until a toothpick inserted into the center comes out clean. Cool on a wire cooling rack. Remove by pulling on side of parchment or aluminum foil. Cut into squares and serve.