Lemon Muffins with a cream-cheese centre

This is a recipe I've cut out of a magazine ages ago, and they disappear quickly.
Makes 12 muffins.

2 cups plain flour
1 tsp bicarb soda
2 eggs
125g butter
250ml milk
2 tsp grated lemon rind
2 tsp lemon juice

Filling
150g cream cheese, softened
2 tbsp caster sugar
1 tbsp lemon juice
1/2 tsp vanilla

Heat oven tp 180 C. Grease muffin pan or use liners.
Filling: Combine cream cheese, sugar, lemon juice and vanilla.
Sift together flour and bicarb. in a large bowl., then add sugar.
In a jug, lightly wisk together melted butter, eggs, milk, lemon rind and juice. Mix this into the flour until JUSt combined.
Spoon batter into muffin tray to half fill.. Spoon the cream cheese mixture into muffin, then top up muffin with remaining batter.
Bake for 20 mins. Cool 5 mins then turn out.