In large bowl, beat 1/3 cup butter with electric mixer on medium speed until fluffy. Beat in crema, 1/4 teaspoon cinnamon and 3/4 teaspoon vanilla until light and fluffy, scraping bowl frequently. On low speed, add powdered sugar, 1 cup at a time, scraping bowl occasionally. Stir in milk, one teaspoon at a time, until smooth and spreadable. Frost cake. Sprinkle lightly with cocoa. Store in refrigerator.