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Mix butter and flour over medium heat on stove and whisk until combined.
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Cook for about 5 minutes until it is golden brown.
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Add chicken broth, thyme, garlic powder, salt and pepper.
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Stir until thick.
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Remove from heat.
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Add milk, chicken, vegetables and onion and mix.
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Pour mixture into casserole dish.
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Place biscuits on top of mixture.
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Bake at 450 degrees fahrenheit for 30-40 minutes or until heated throughout and biscuits are cooked and golden.