Preheat the oven to 350*. Grease the bottom and sides of an 11" X 7" bakinbg dish.
Heat the butter in a skillet over medium-high heat. Stir in the chopped onion. Saute' until tender.
Combine onion, chicken, soup,m sour cream, milk and pinento in a medium bowl and mix well. Mixture will be thick.
Spoon mixutre into prepared baking dish. Bake for 15 minutes. Remove from oven.
Sprinkle baked layer with 3/4 C. of cheese. Arrange biscuits in single layer over top. Sprinkle with remaining cheese.
Bake until biscuits are golden brown and the sauce is bubbly, about another 20 - 25 minutes. Serve immediately.
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