Boil the liquids: In a medium saucepan, combine the water and milk. Bring to a gentle boil over medium heat.
Add the oats: Once the liquid begins to boil, add the oats and stir well. Reduce the heat to low and let it simmer for about 5–10 minutes, stirring occasionally, until the oats soften and thicken.
Add sweeteners and spices: Stir in the brown sugar, cinnamon, nutmeg, and cloves. Let it simmer for another 2-3 minutes to blend the flavors.
Finish and serve: Remove from heat and stir in the vanilla extract and a pinch of salt. Taste and adjust sweetness or spices as needed. Spoon the avena into bowls and top with your favorite add-ins or toppings.
Serve warm: Serve immediately while it's still warm. Enjoy your comforting Puerto Rican Avena!