Follow these steps to create your amazing Banoffee Cake with ease:

1. Preheat the Oven: Set your oven to 350°F (180°C) and grease two 9-inch round cake pans.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking powder, baking soda, and salt.
3. Cream the Butter and Sugar: In a large mixing bowl, beat the softened butter and sugar until light and fluffy.
4. Add Eggs and Vanilla: Beat in the eggs one at a time. Then, stir in the vanilla extract.
5. Combine Wet Ingredients: Gradually mix in buttermilk and mashed bananas, blending well.
6. Add Dry Mixture: Slowly add the dry ingredients to the wet ingredients, mixing until just combined.
7. Pour Into Pans: Divide the batter evenly between the prepared cake pans.
8. Bake: Place the pans in the oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool the Cakes: Once baked, remove the cakes from the oven and allow them to cool in the pans for 10 minutes. Then, transfer them to a wire rack to cool completely.
10. Prepare the Toffee: In a saucepan, combine sweetened condensed milk and dark brown sugar. Cook on low heat, stirring constantly until thickened, about 5-10 minutes.
11. Assemble the Cake: Once the cakes are cool, place one layer on a serving plate. Spread half of the toffee mixture on top, followed by slices of banana.
12. Add the Second Layer: Place the second cake layer on top and repeat the process with the remaining toffee and banana slices.
13. Whip Cream: In a mixing bowl, whip the heavy cream until soft peaks form.
14. Top the Cake: Spread the whipped cream over the top of the cake, garnishing with chocolate shavings or a dusting of cocoa powder as desired.

These steps will guide you in creating an incredible Banoffee Cake that’s sure to impress.