Brigadeiro(chocolate fudge candy)

1 can 14ox of sweetened condensed milk
l tablespoon butter
3 tablespoon cocoa powder, but I just 12 oz bag of chocolate chips
1 teaspoon vanilla

Heat over low heat, stir until thickens. Let cool to room temperature. Take small amount and roll into balls over chocolate sprinkles. Helps to grease your hands to make the balls. Put balls in small paper cupcake holders.