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Heat oven to 375 degrees.
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Fry the bacon until it's crispy, drain on paper towels and crumble.
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Cook egg noodles as directed on package, drain and toss with the 2 tablespoons butter.
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In a 2 quart casserole layer as follows: 1/4 of the noodles, 1/4 of the sour cream, 1/4 of the cheddar cheese, 1/4 of the bacon and 1/4 of the onion.
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Repeat these layers 3 more times.
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Bake the casserole in preheated oven, uncovered for 30 minutes.