Preheat oven to 350F and lightly grease an 8×8-inch baking pan.
In a medium bowl, stir together graham cracker crumbs, oats and melted butter. Pour into prepared pan and press into an even layer, using your fingertips,the back of a spoon or a spatula. Spread white chocolate chips in a layer on the graham crackers. Spread macadamia nuts in a layer on the chocolate chips. Spread coconut in a layer on top. Pour sweetened condensed milk evenly over everything.
Bake for 25-30 minutes, or until coconut is golden brown.
Cool completely before slicing.
Bars can be served at room temperature or chilled.
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