Heat 2 tsp oil in a skillet over med-high; drain 2 packets of beef, break into bite-size pieces, add to pan + sauté 3-4 min until hot

Meanwhile, tear corner of rice to vent + heat in microwave 90 sec (careful—it'll be hot!); if using a skillet, warm 2 min with 1 tbsp water

Stack 4 tortillas on a plate + wrap with a damp paper towel; microwave 15-30 sec or until warm + soft; divide beef among tacos then sprinkle each with 1 tbsp cheese; serve with rice on the side