Preheat the Oven: Preheat your oven to 180°C (350°F). Grease and lightly flour your mini cake molds or muffin tin.
Whip Eggs and Sugar: Beat the eggs in a large bowl until frothy. Gradually add sugar, mixing until the mixture becomes pale and almost doubles in volume.
Add Oil: Slowly drizzle in the vegetable oil, mixing continuously to maintain a creamy texture.
Mix Dry Ingredients: In a separate bowl, sift together the flour and baking powder.
Combine Wet and Dry: Gently fold the dry ingredients into the egg mixture until just combined, being careful not to overmix.
Add Milk and Flavorings: Stir in milk until the batter reaches a thick but slightly pourable consistency. Add lemon juice (or vinegar) and vanilla extract.
Fill the Molds: Spoon the batter into each mold or muffin cup, filling halfway.
Add the Filling: Sprinkle apples, raisins, and nuts over the batter. Mix brown sugar and cinnamon, then sprinkle over the top.
Bake: Bake for 25-30 minutes, until the tops are golden, and a toothpick inserted into the center comes out clean.
Cool and Serve: Let the mini cakes cool in the pan for 10 minutes, then transfer to a wire rack. Serve warm or at room temperature.