I guess it depends on your definition of easy, and part of why this is easy for me is that I always have cooked diced chicken breast ready to go in the freezer (I cook chicken breasts up in my crock pot, diced them, and freeze it on the weekends when I have the time).
Chicken Enchilada Verdes (or as my husband calles them "green chicken roll up thingies")
1 tablespoon butter or olive oil
1 pound cooked chickent breast, diced
1 small yellow onion diced
1 or 2 cloves garlic minced
1 to 2 teaspoons ground cumin
2 tablesoons choped cilantro
2 4 oz. cans diced chilies
2 10oz. cans green chili Enchilada Sauce
8 oz monterey jack cheese, shreaded (pepper jack cheese also good)
10 flour tortillas
Pre-Heat oven to 350
In frying pan sautee onion in butter or oil until soft. Add diced garlic for about 30 seconds and then add chicken, cumin, and diced chilis (both cans). Once heated through, add cilantro and remove from heat. Pour one can of enchilada sauce in 9x13 or similar sized baking dish. Place 2-3 tablespoons of chicken filling on tortila with a pinch of cheese, roll, and place in dish seam down or to the side so it stays closed. Repeat until you've rolled all 10 torillas. Top with 2nd can of green enchilada sauce and remaining cheese. Bake for 20 minutes or until sauce bubbles and cheese is just starting to brown. Serves 5 to 6 people.
Since I have the chicken cooked already the filling only takes me about 5 minutes to make up. I mince the garlic while the onions are cooking and then I chop the cilantro and grate the cheese while the chicken is heating up with the onions, and it takes about another 5 minutes or so to roll the enchiladas. So I guess this makes it a 30 minute meal. Eat your heart out, Rachael Ray!

If you've never had green enchilada sauce, it's just a bit more spicy than red enchilada sauce (it's not flaming hot, just kicked up a notch), so keep that in mind if you usually prefer more mild flavors.