100gr unsalted butter softened
100gr golden caster sugar
1 egg, lightly beaten
1 teaspoon vanilla extract
280gr plain flour, plus extra for dusting
250gr royal icing sugar
Red, blue, green, yellow, orange and black gel food colouring
Caramel flavouring (for brown colour)
Gold edible glitter (optional)
How to bake
1. Pre-heat the oven to 190ºC/374ºF and line a baking sheet with baking parchment.
2. Using an electric whisk, beat the butter and sugar together in a large mixing bowl until it is pale and fluffy.
3. Gradually beat in the egg and vanilla extract.
4. Stir in the flour, then knead the mixture briefly to make a dough.
5. On a floured work surface, roll out the remaining dough to the thickness of a coin.
6. Using plain round biscuit cutters, cut out the following size biscuits: 1 x 8cm/3inch, 2x7cm/2.5inch, 4x6cm/2inch, 2x5cm/1.9inch and 1×3.5cm/1.3inch.
7. Carefully transfer the biscuits to the prepared baking sheet and bake for 10-12 mins until pale golden brown.
8. Leave them on the baking sheet for 5 mins, then transfer to a wire rack to cool completely.
9. Mix the icing sugar with 2-3 tbsp water to make a smooth, spreadable icing.
10. Spoon 1 tsp of the icing into a small bowl and add yellow food colouring to make it bright yellow, then use to cover the largest biscuit and set aside to dry.
11. Spoon 2 tsp of the white icing into another small bowl and add in blue food colouring to make it a bright, light blue.
12. Use a little of this icing to cover a 6cm biscuit to make Uranus. Set aside to dry.
13. Add a little more blue colour to the blue icing and use a little to cover another 6cm biscuit, to make the water on the Earth and set aside to dry.
14. Add a little more colour to the blue icing and cover another 6cm biscuit.
15. Using a cocktail stick, swirl a little extra blue food colour and white icing onto this iced biscuit to make Neptune and set aside to dry.
16. Add a little more blue and a tiny bit of black food colouring to the blue icing and spread it over the 3.5 cm biscuit to make Pluto and set aside to dry.
17. For Mercury, spoon 1 tbsp of the white icing into another bowl and add the caramel flavouring to make a beige colour.
18. Spread a little of it over a 5cm biscuit.
19. Using a cocktail stick, swirl a little extra caramel flavouring into the icing on the biscuit and set aside to dry.
20. Spread a little of the beige icing over a 7cm biscuit.
21. Using a cocktail stick, ￼swirl in a little red food colouring and white icing to make the patterns of Jupiter and set aside to dry.
22. For Saturn, add a little yellow food colouring to the beige icing and spread it over the other 7cm biscuit, leaving a 1cm border around the edge.
23. Use a cocktail stick to swirl a little yellow food colouring into the icing and set aside to dry.
24. For Venus, add a little orange food colouring to the beige icing and spread some over the remaining 6cm biscuit.
25. To finish Earth, spoon 1 tsp white icing into another small bowl and add enough green food colouring to make it bright green.
26. Blob a little of the green icing over parts of the blue icing.
27. For Mars, spoon 1tsp white icing into a small bowl and add enough red food colouring to make it bright red.
28. Spread the red icing over a 5cm biscuit.
29. Using a cocktail stick, swirl a little red food colouring into the icing and set aside to dry.
30. Fit a plain nozzle to a piping bag and add the remaining white icing.
31. Pipe 2 stripes around the middle of the Saturn biscuit to give it its rings.
32. If you like, you can sprinkle the Mercury and Venus biscuits with a little edible gold glitter to make them sparkle.