Step 1

Preheat the oven to 190C/180C Fan/Gas Lightly grease a 20x20cm/8x8in square tin.

Step 2

Cream the butter and sugar together in a mixing bowl using an electric hand whisk or a wooden spoon.

Step 3

Add the eggs one at a time, beating until smooth after each addition. Mix in the flour (or ground nuts or oats) and mix until well combined. Gently stir in the mango and white chocolate.

Step 4

Pour the batter into the prepared tin. Bake for 40–45 minutes. Cool in the tin for 10 minutes before turning it out and slicing into squares.