Cream together the butter and sugar using a hand mixer.
Add in the egg yolk and vanilla extract. Mix with a rubber spatula until it is combined
Add in the flour and mix until a dough forms
Separate the dough and dye the dough green and brown for the avocado Jellycat
Take the green dough and separate it into 10 equal sized balls. Press down on each ball and press it into the shape of an avocado
Ball up small pieces of brown dough and use it as the Jellycat feet
Use a 1/2 tsp measuring spoon to press an indent where the avocado pit will go
Bake at 177C/350F for 12-14 minutes
Let the cookies cool
Add some melted chocolate into the indentation of the cookie and then add in a chocolate Lindor ball. The melted chocolate will help the Lindor ball stick to the cookie
Use the melted chocolate to draw on the Jellycat face