Preheat the oven to 350°F (175°C). Grease a mini muffin pan with nonstick cooking spray or oil.
In a large bowl, whisk together ¼ cup whole milk, ¼ cup vegetable oil, and 2 large eggs until smooth and combined.
Add 5 ounces finely crumbled queso fresco, 2 ounces freshly shredded medium cheddar, and 1 teaspoon kosher salt to the bowl. Use a rubber spatula to fold the cheeses and salt into the liquid until evenly distributed.
Add 1 cup cassava flour to the mixture. Stir with the spatula until no dry lumps of flour remain and the batter is cohesive.
Using a 2-teaspoon measuring spoon (or a small scoop), portion the batter into the greased mini muffin cups, filling each about level with the rim.
Bake for 13–15 minutes, or until the tops are golden brown.
Remove the pan from the oven, transfer the pandebono to a wire rack to cool, and enjoy.