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Heat 2 tbsp butter in medium saucepan.
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add rice and cook until golden, stirring.
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add onion and celery and continue cooking gently 3 minutes, stirring.
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add chicken broth and salt, cover and simmer 20 minutes or until rice is tender (if rice is still very moist cook with cover off for a few minutes).
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remove from heat.
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stir egg, cheese, and Worcestershire sauce together with a fork and mix into rice along with the parsley.
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heat oven to 350 degrees.
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cut avocados in half, remove pits and put avocado halves in a shallow baking dish.
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add 1/4 inch hot water to the pan.
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spoon rice mixture into hollows of the avocados.
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combine bread crumbs and melted butter and sprinkle over rice mixture.
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bake 20 minutes or until crumbs are browned and avocados are hot.