Preheat oven to 400°F (200°C).
Mix 1 tablespoon of sugar with 1 teaspoon of cinnamon. Then grease a Bundt pan and dust it with the sugar and cinnamon mix.
Cut the guava paste into little cubes, coat it with flour, and set aside.
In a mixer, beat egg whites until stiff peaks form.
Add yolks one by one, and mixing after each addition
Alternate between adding sugar, oil, and milk and mixing after each addition.
Turn your mixer off and mix in flour
Add fine ground corn flour and turn your mixer back on to gently combine everything together.
Turn mixer off, add baking powder and gently combine using a silicone spatula.
Transfer 3/4 of the batter to the pan, add half the guava cubes, top with remaining batter and finish with another layer of guava on top.
Bake at 400°F for 40 mins, then lower to 300°F for 5 mins or until a toothpick comes out clean. Let it cool.