Food Network teaches how to crush, slice and mince garlic. Peel off some of the papery skin from the garlic and then smash the head of garlic with the heel of your hand to loosen the cloves; if you only need a few cloves, leave the head intact and pull some off. Separate the cloves. To peel a clove, cut away the root end with your knife. Lay the flat side of the knife over the clove while holding the knife handle, then with the heel of your free hand carefully whack the knife against the garlic to separate the skin from the clove. To crush the peeled garlic, lay the flat side of the knife over the clove and smash it again. To slice peeled garlic, lay the clove flat on the cutting board and hold it with the fingertips of one hand, keeping them curled under. Using a rocking motion with the knife, make thin slices by moving the knife slowly across the clove. To mince peeled garlic, lay the flat side of a knife over the clove and smash it. Roughly chop the clove then move your free hand flat across the tip of the knife and use a rocking motion to chop the garlic until it’s finely minced.
Put the tomatillos, onion, serrano, yellow chile and 3/4 cup water in a medium, heavy saucepan. Bring to a boil over medium-high heat. Cover and boil until the tomatillos turn olive-green color, about 10 minutes. Transfer the tomatillos, onion and chiles to a blender. Add the garlic and cilantro and blend until smooth. Season with salt and pepper.
Heat the oil in a small skillet over medium-high heat. Fry the tortillas until golden but still pliable, about 10 seconds per side. Transfer to paper towels to drain.
Put the tortillas on a work surface. Divide the shredded chicken evenly among the tortillas and roll up each like a cigar. Spread 1/3 cup sauce in a 9 by 13-inch glass baking dish. Arrange the enchiladas, seam-side down, in one layer snugly inside the dish. Pour the remaining sauce over the enchiladas.
Drizzle with the Mexican crema and sprinkle the cheese all over. Bake until the cheese melts and starts to brown in spots, about 30 minutes. Serve immediately.