1-Preheat and Prepare: Begin by preheating your oven to 140°C (fan) or 160°C (conventional) to ensure even baking. Prepare your cake tins by spraying them with oil and lining them with parchment paper for easy release.

2-Mix Dry Ingredients: In a large bowl, mix together the all-purpose flour, caster sugar, baking powder, and salt until well combined.

3-Add Wet Ingredients: Add the softened unsalted butter and cut it in until the mixture looks crumbly, then incorporate the eggs, milk, vegetable oil, peppermint extract, vanilla extract, and Greek yogurt, mixing just until blended. For that festive marbled look, divide the batter in half and stir in the red food gel to one portion.

4-Bake: Alternately drizzle the red and plain batters into the prepared tins to create the marbled effect, then bake for about 45 minutes or until a toothpick comes out clean. Let the cake cool completely before moving on.

5-Frost and Decorate: Once cooled, prepare the frosting by adding peppermint extract and dividing it into bowls for coloring with the specified food gels. Trim the cake tops if necessary, spread pink frosting on a cake board, stack the layers, cover with frosting, and chill for 2 hours. Finish by applying green frosting, piping decorations, and adding sprinkles for a festive touch.