Preheat the oven: Set oven to 350°F (175°C). Line or grease 2 muffin cups per serving.
Make muffin batter: In a mixing bowl, combine crushed pineapple, shredded coconut, and mashed banana. Stir in vegetable oil, egg, and vanilla extract until well blended.
Add dry ingredients: Add granulated sugar, cinnamon, salt, and baking soda. Mix to combine. Gently fold in all-purpose flour, then stir in chopped macadamia nuts. Do not overmix.
Fill and bake: Divide the batter evenly into the prepared muffin cups. Top with extra chopped nuts if desired. Bake for 20–22 minutes, or until a toothpick inserted in the center comes out clean. Cool in pan for 5 minutes, then transfer to a wire rack.
Prepare the smoothie: In a blender, combine strawberries, oat milk, maple syrup, vanilla extract, and ice if using. Blend until smooth and creamy, about 45–60 seconds. Adjust sweetness and texture if needed.
Serve the muffins with fresh fruit and smoothie. Enjoy your easy and uplifting breakfast!