Pupusas are thick corn tortilla cakes stuffed with savory ingredients such as beans, meat, or—in this recipe—cheese.
STIR: In bowl, stir together masa harina and salt. Add warm water and oil. Stir well until no dry masa remains and soft dough forms, about 1 minute. Cover with plastic wrap and let rest for 15 minutes.
CUT: While dough rests, use scissors to cut side seams of large zipper-lock plastic bag, leaving bottom seam intact. Open bag and spray inside of bag lightly with vegetable oil spray. Set aside.
PORTION: When dough is ready, roll dough into 8 equal balls (about ⅓ cup each). Place on large plate and cover with damp dish towel.
Too dry
Just right
FILL: Pat 1 dough ball into 4-inch circle. Squeeze ¼ cup Monterey Jack into ball. Place cheese ball in center of dough circle, pull sides over, and pinch at top. Roll into smooth ball. Repeat with remaining dough.