Preheat oven to 425°. In a large bowl, combine pancake mix and coconut. Stir in milk just until dry ingredients are moistened; let stand 10 minutes. Meanwhile, line a 15x10x1-in. baking pan with parchment paper; grease paper with coconut oil.
Spread batter into prepared pan; sprinkle with macadamia nuts. Bake until puffy and golden brown, 15-20 minutes. Cool in pan on a wire rack 5 minutes. Lifting with parchment paper, remove from pan. Top with bananas; serve with butter and syrup.