01 -
Wash, peel, and cook sweet potatoes by boiling for 20–30 minutes or roasting at 400°F until tender. Mash while warm until smooth and measure 1½ cups.
02 -
Peel, core, and grate Gala apples finely. Lightly squeeze to remove some excess moisture while retaining juice to maintain cake moisture.
03 -
In a large bowl, whisk together all-purpose flour, baking powder, baking soda, salt, cinnamon, nutmeg, and ginger until uniformly mixed.
04 -
In a separate bowl, beat vegetable oil, brown sugar, eggs, and vanilla extract until smooth and well blended. Stir in mashed sweet potatoes, then fold in grated apples gently.
05 -
Add wet ingredients to dry and fold gently with a spatula or wooden spoon until just combined without visible flour streaks to avoid dense texture.
06 -
Preheat oven to 350°F. Grease and flour a 9-inch cake pan. Pour batter evenly, smooth top, and bake 35–40 minutes or until a toothpick comes out clean or with few moist crumbs.
07 -
Allow cake to cool in pan for 15 minutes, then transfer to wire rack. Whisk melted butter and brown sugar and brush over warm cake for a caramelized finish.