Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Lightly grease a 9x9-inch baking dish.

Place chicken on a microwave-safe plate; cover with a paper towel. Cook on high power until cooked through and no longer pink, about 10 minutes.

Cool, then shred using a knife; set aside.

Cook and stir refried beans in a saucepan over medium until thoroughly heated.

Layer 1/2 the chips, 1/2 cup cheese, and green onions on bottom of the prepared baking dish. Spoon beans over top.

Layer 1/2 cup cheese and sour cream over beans. Arrange shredded chicken over top, then top with remaining 1/2 chips and 1/2 cup cheese.

Bake in the preheated oven until cheese melts throughout, 15 to 18 minutes.