Meatless Mexican Lasagna

I requested this from my friend Betsy. It works great for a freezer meal too:

2 c. frozen corn, thawed
2 cans (15 oz.) black beans, rinsed and drained
1 can (14.5 oz.) diced tomatoes with basil, oregano, and garlic- undrained
1 can chopped green chilies
3 green onions, sliced
2 tsp. dried oregano
2 tsp. ground cumin
6 corn tortillas (6 inch or larger)
1 ½ cups colby jack cheese
sour cream for topping

Heat oven to 350.
Combine first 7 ingredients in a bowl.
place three corn tortillas in a greased (with butter or spray) 13 x 9 pan. Place half of filling on top of tortillas and repeat the steps. Top with cheese and bake for 25-30 minutes. Garnish with sour cream.