1. Preheat your oven to 350°F (175°C) and grease a 9×13 inch baking pan.
2. In a large bowl, cream together the butter and sugar until light and fluffy.
3. Add the eggs one at a time, mixing well after each addition.
4. Stir in the guava puree and coconut milk until well combined.
5. In another bowl, whisk together the flour, baking powder, and salt.
6. Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
7. Pour the batter into the prepared baking pan and smooth the top.
8. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
9. Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
10. Serve with whipped cream or a dusting of powdered sugar.

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