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1
Position a rack in the center of the oven, and preheat oven to 350 degrees.
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2
Heat the oil in a large skillet over medium-high heat. Season the chicken as you see fit, and add it to the skillet. Cook, stirring quite often, just until it turns opaque and loses its raw look, about 8 minutes. Transfer the chicken to a plate.
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3
Add the butter to the skillet, and reduce the heat to medium. Add the onion and celery and cook, stirring often, until the vegetables soften, about 3 minutes. Sprinkle the flour over the mixed vegetables and mix well. Add the broth and half-and-half, and bring to a boil, stirring up the browned bits from the bottom of the pan with a wooden spoon. Cook until the sauce is slightly thickened, about 5 minutes.
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4
Stir in the reserved chicken, thawed mixed vegetables, and parsley. Season with salt and pepper as desired. Pour into an ungreased 2 1/2 to 3 quart round casserole, or, if you don't have one (like me!), pour into whatever casseroles you have.
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5
Mix the Bisquick and buttermilk to make a soft, slightly sticky dough. Drop six large spoonfuls of the dough over the chicken mixture (or, if you're using two casseroles, make eight or nine smaller biscuits).
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6
Pop the casserole(s) in the oven, and bake for 25 to 35 minutes, until biscuits are golden brown.
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7
You're done!
