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Combine the masa, rice flour, and salt together in a medium mixing bowl then mix in the water.
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Knead the dough into a smooth, moist sticky dough.
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If it is too dry, you can add one teaspoon at a time of water.
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Wet your hands to form 10 round balls about the size of a golf ball. (I used a kitchen scale and each ball weight was 2 1/4 ounces)
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With your hands, press a ball into a flat disk by a bit bigger than your palm.
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Add 2 tablespoons of filling in the center and form the dough around the filling.
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Pinch the edges together, roll it into a ball and then flatten the ball to about 1/2 inch thick.
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Try your best to repair any holes.
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Place the pupusa on a large nonstick pan with some olive oil and cook on medium-high until each side is golden brown.
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About 3 -5 minutes on each side. Don't worry if some cheese leaks out.