Preheat oven to 350F. Line a 12 hole muffin pan with 12 cupcakes liners. Cut the guava paste in small cubes. Set a side.
Place the butter, sugar and eggs in a big bowl. Mix well , add the flour little by little until you get an uniform batter. Finally add the vanilla.
Fill every cupcake liner half way , add 2 cubes of guava paste then pour more batter until you fill every liner 3/4.
CREAM CHEESE FROSTING..beat, cream cheese ,butter, sugar and vanilla until you get a creamy frosting. Decorate every cupcake with the frosting and a little cube of guava on top.If you don't like frosting just sprinkle confectioner sugar on top.