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Preheat oven to 350* and butter 13x9 glass baking dish.
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Cook pasta (about 8 min) and drain.
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Melt butter in heavy large saucepan over medium to low heat, then add flour and cook 1 minute stirring constantly (do not allow to brown).
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Gradually whisk in cream and milk and simmer until mixture thickens slightly, whisking occasionally (about 3 minutes).
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Reduce heat to low and add grated cheddar cheese and only 1 cup blue cheese.
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Whisk about 2 minutes or when cheese starts to melt, then flavor with salt and pepper.
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Add cooked pasta to sauce, stirring to coat, and transfer mixture to 13x9 dish.
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Sprinkle with remaining 1/2 cup blue cheese and bake about 25 minutes or until sauce begins to bubble.
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Sprinkle with chives and serve- enjoy!