Preheat oven to 180°C/160°C fan forced. Grease a 12 hole (1/2 cup) muffin pan with oil spray.

Sift flour and cocoa into a large bowl. Stir in sugar. Stir through the frozen raspberries. Make a well in the centre

In a jug, whisk eggs, buttermilk or milk and oil until smooth. Add mixture to dry ingredients. Using a large metal spoon, gently stir until just combined. Spoon half the muffin mixture into prepared pans

Place an Easter egg in the centre of each. Top with remaining muffin mixture. Bake for 25-30 minutes until just firm to touch and cooked through when tested with a skewer. Cool in pan for 10 minutes

Ease the muffins from the pan (you may need to run a blunt knife around the edges) onto a cooling rack Dust with icing sugar to serve. Best served warm.