* Available in finer supermarkets and Hispanic specialty shops.
Preheat oven to 350 degrees F.
Beat butter and sugar together until light and fluffy. Sift together the flour, baking powder, spices, and salt and add the butter mixture, mixing until well combined. Add the eggs one at a time and mix well. Spoon half the batter into a buttered 8-inch square baking pan. Top with the sliced guava paste and cover with the remaining batter. Bake for 35 to 40 minutes until golden brown. Cool on a wire rack.
