Stir in 2 1/2 cups arepa flour, breaking up any clumps of flour, until the consistency is similar to mashed potatoes. Knead in 2 tablespoons room-temperature unsalted butter until uniformly combined.

To make arepas con queso, you'll need masarepa flour, salt, sugar, unsalted butter, freshly shredded part-skim mozzarella cheese, whole milk, lukewarm water, and nonstick cooking spray.