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Preheat oven to 400 degrees.
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Coat 4 (6 ounce) ramekins with cooking spray; sprinkle evenly with breadcrumbs, tilting and turning dishes to coat sides completely.
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In a heavy saucepan, melt butter over medium heat.
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Add onion and cook for 1 minute.
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Sprinkle with flour.
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Cook, stirring, until mixture begins to pull away from pan.
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Gradually whisk in milk.
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Return to medium heat; cook, stirring, for 3 minutes or until thickened and bubbly.
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Remove from heat.
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Whisk in a large bowl, the egg yolks, salt, pepper, dry mustard, and garlic powder.
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Temper the yolk mixture, by putting some of it into the onion milk sauce, then add all the onion milk sauce back into large bowl of yolks.
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In a medium sized bowl, beat the egg whites and cream of tartar until stiff peaks form that do not fall over when the whisk is lifted.
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Gently fold the egg whites and Cheddar into cooled sauce in large bowl.
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Divide mixture evenly among four custard cups.
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Sprinkle with Parmesan.
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Put custard cups on a baking sheet so that they are easier to handle.
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Bake for 20 minutes.
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Souffle should still be moist in center; do not overcook and yes it will fall but that is the nature of a souffle.