Preheat oven to 350°F. Combine all ingredients in a large bowl except butter, salsa and sour cream.
Melt butter and pour into a 9x13-inch pan, quickly swirling to coat bottom.
Pour mixture into pan and bake 50-60 minutes, until golden brown and puffy.
About 10 minutes before casserole is ready, warm up salsa verde in a saucepan.
Remove casserole from oven and let rest for 5-10 minutes before serving. Pour salsa verde over the casserole, reserving some for individuals to add more if desired. Top with a dollop of sour cream.
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