Mix the first seven ingredients, butter with vanilla extract. Mix in the next four ingredients, flour to nuts, quickly - do not stir too long! Fold in papaya last.
Also equip a 12-piece muffin tin with the paper muffin molds and distribute the batter in it. Bake in the preheated oven for about 25 minutes until they are brown on top and a toothpick comes out when testing. Let cool in the tin for ten minutes, then place the muffins on a wire rack to cool completely.