Preheat Oven and Prep Pan:
Heat oven to 350°F (175°C). Grease lightly or line a 9x5-inch loaf pan with parchment.Mix Dry Ingredients:
Combine flour, baking powder, salt, and sugar in a large bowl; whisk together.Whisk Wet Ingredients:
In a separate bowl, whisk eggs, oil, vanilla, and the full can of crushed pineapple (including juice).Combine Wet and Dry:
Add the wet mixture to the dry ingredients; stir just until incorporated—do not overmix. If using, fold in optional coconut or nuts.Bake Until Golden:
Transfer batter to the prepared pan; smooth the surface. Bake for 55–65 minutes, until a toothpick inserted in the center comes out clean. If the top browns too quickly, loosely cover with foil for the last 15–20 minutes.Cool and Serve:
Cool in the pan for 10 minutes, then turn out onto a wire rack. Slice and serve warm or at room temperature.