Add tomatillos, garlic clove, and jalapeño to a saucepan and cover in water. Bring to a boil and simmer for ten minutes until soft. Then set aside to cool down.
In a food processor or blender add the cooked tomatillos, jalapeño, garlic, 3-4 sprigs of cilantro, ¼ cup of sliced white onion, oregano and salt. Blend until smooth. Set aside.
Transfer the salsa to a deep bowl, big enough to dip the corn tortillas
In a skillet add about 2 tablespoons of vegetable oil on medium high heat. Add the corn tortillas for a few seconds on each side, flipping them carefully with tongs to prevent from tearing. Then set aside on top of napkins or paper towels to remove the excess oil.
Assemble the entomatadas - Heat shredded chicken in the microwave for about 60-90 seconds to warm up and set aside.
Dip your corn tortillas in the green salsa bowl. Flip both sides to coat them with the salsa and transfer to a plate
Add in your filling: shredded chicken and crumbled queso fresco (1-2 tbsp) and fold in half.
Top with cilantro, sliced white onion, crumbled queso fresco and more salsa on top and serve immediately.