Step 1. Preheat the Oven and Prepare the Tin

Preheat your oven to 180°C (160°C fan) or 350°F. Grease and line a 9-inch round cake tin with parchment paper to prevent sticking.

Step 2. Cream the Butter and Sugar

In a mixing bowl, beat the softened butter and light brown sugar together until light and fluffy, about 3-4 minutes.

Step 3. Add the Eggs

Add the eggs one at a time, beating well after each addition to ensure they are fully incorporated.

Step 4. Fold in the Dry Ingredients

Sift the self-raising flour, baking powder, and ground cinnamon into the mixture. Gently fold in until just combined, being careful not to overmix.

Step 5. Add the Apples

Fold in the sliced apples, distributing them evenly throughout the batter.

Step 6. Bake the Cake

Pour the batter into the prepared cake tin and smooth the top with a spatula. Bake in the preheated oven for 45-50 minutes, or until a skewer inserted into the center comes out clean. Allow the cake to cool in the tin for 10 minutes, then transfer it to a wire rack to cool completely.

Step 7. Prepare the Toffee Topping

In a saucepan over medium heat, combine the butter, light brown sugar, and milk. Stir continuously until the butter has melted and the mixture is smooth. Bring to a gentle simmer and cook for 2-3 minutes, or until thickened slightly. Remove from heat.

Step 8. Pour the Toffee Topping Over the Cake

Once the cake has cooled, pour the warm toffee topping over it, allowing it to drip down the sides. Let the topping set slightly before slicing and serving.