Chicken and Avocado Croissant Sandwhich

1/2 avocado
1 tbsp sour cream
1 tsp lemon juice
2 large croissants, halved
2 T mayonnaise
1/2 cup cooked chicken breast, shredded

Put the flesh of the avocado in a small bowl together with the lemon juice and sour cream and mash with a fork.

Spread on halved croissants on one side with mayonnaise and the other slice with the avocado mixture. Place the chicken on top of the slice with the mayonnaise and top with the bread covered with the avocado.