Pre-heat your oven to 180℃/370℉. Line a 12 hole muffin pan with muffin/cupcake liners.
In a small bowl, break up the white chocolate and melt in the microwave in 20 second intervals, stirring in between to make sure it doesn’t burn. Alternatively do this using a double boiler: Place the chocolate in a heat proof bowl resting on a small saucepan with simmering water. Stir until melted.
In a large mixing bowl, whisk together the melted butter and both sugars. Add in the eggs and vanilla extract and mix again.
Whisk in the melted white chocolate until fully incorporated. Add the flour and lemon zest and fold to combine. Pour into the lined dish.
Bake 20 minutes. Remove from the oven, and after letting cool off just for a few minutes, use a tablespoon measure/end of a wooden spoon to create the indent - create lots of room to fill with cheesecake!