If you prefer, Monterey Jack can be used instead of cheddar, or, for a mellower flavor and creamier texture, try substituting an equal amount of farmers' cheese.

FOR THE SAUCE AND FILLING: Heat oil in medium saucepan over medium-high heat until hot and shimmering but not smoking, about 2 minutes; add onion and cook, stirring occasionally, until softened and beginning to brown, about 5 minutes. Add garlic, chili powder, coriander, cumin, salt, and sugar; cook, stirring constantly, until fragrant, about 30 seconds. Add chicken and cook, stirring constantly, until coated with spices, about 30 seconds. Add tomato sauce and ¾ cup water; stir to separate chicken pieces. Bring to simmer, then reduce heat to medium-low; simmer uncovered, stirring occasionally, until chicken is cooked through and flavors have melded, about 8 minutes. Pour mixture through medium-mesh strainer into medium bowl, pressing on chicken and onions to extract as much sauce as possible; set sauce aside. Transfer chicken mixture to large plate; freeze for 10 minutes to cool, then combine with cilantro, jalapeños, and cheese in medium bowl and set aside.

Adjust oven racks to upper and lower-middle positions and heat oven to 300 degrees.

TO ASSEMBLE: Smear entire bottom of 13 by 9-inch baking dish with ¾ cup chili sauce. Place tortillas on two baking sheets. Spray both sides lightly with cooking spray. Bake until tortillas are soft and pliable, about 4 minutes. Place warm tortillas on counter-top. Increase oven temperature to 400 degrees. Place ⅓ cup filling down center of each tortilla. Roll each tortilla tightly by hand and place in baking dish, side by side, seam-side down. Pour remaining chili sauce over top of enchiladas. Use back of spoon to spread sauce so it coats top of each tortilla. Sprinkle ¾ cup grated cheese down center of enchiladas. Cover baking dish with foil. Bake enchiladas on lower-middle rack until heated through and cheese is melted, 20 to 25 minutes. Uncover and serve immediately, passing sour cream, avocado, lettuce, and lime wedges separately.

TO MAKE AHEAD: The sauce and filling can be prepared (step 1) up to 2 days ahead and refrigerated in an airtight container; however, the enchiladas should be assembled shortly before baking.

Assembling Enchiladas