Preheat oven: 180°C / 160°C (fan) / Gas Mark 4 / 350°F
Cut your mini crème eggs in half along the seam (or your regular-size crème eggs into four pieces) and set aside.
In a large heatproof bowl, melt the butter for 30-50secs in the microwave and beat in the sugars until smooth and thickened.
Thoroughly beat in the egg, vanilla extract and salt.
Sieve in the flour and cornflour, stirring until just combined.
Gently fold in the chocolate chips.
Pour the blondie mix into a greased and lined 8-inch square pan, smoothing the top gently.
Press the chopped crème eggs into the top of the blondie mix in the pan, spaced out.
Bake for 20-25mins until the top is lightly golden and there is only a slight wobble in the middle.
Allow the blondie to cool fully in the tin before removing, then cut into squares and enjoy!