Preheat oven to 175 degrees celcius
Grease 2 x 12 hole muffin tins with butter
Thaw butter puff pastry as per packet directions
Pop eggs, feta, cream cheese, salt and pepper into a food processor and blend for a few seconds until mixture is smooth (ie feta isn't still in lumps)
Pour into a measuring cup with a spout and mix through spinach and mint
Using a glass, cut holes in pastry ( I used a cup with 9cm diameter) and place into muffin holes
Pour the egg mixture into the pastry
I alternated the topping with half a cherry tomato and thinly sliced red onion
Pop into the oven for 20-30 minutes, or until quiches are golden brown
Leave to cook in trays for 5 minutes then remove to a cooling rack