1 1/2 cups all-purpose flour
1 1/2 cups whole-wheat flour, plus more for dusting if needed
1 teaspoon fine salt
1 cup warm water
1/3 cup vegetable or canola oil, , plus more for greasing if using a cast-iron skillet
Black beans and queso duro (hard cheese; see Cook's Note), or ham, crema and queso duro (hard cheese), for serving, optional
Look for queso duro (hard cheese) at a market that carries Latin American products.