"This tuna tetrazzini is a delicious casserole to make for an everyday family meal. Put this casserole together a day in advance, then cover and refrigerate until you're ready to bake and serve...."
INGREDIENTS
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8 ounces thin spaghetti, cooked al dente and drained
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6 tablespoons butter, divided
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16 ounces thinly sliced mushrooms
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4 green onions, thinly sliced
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4 tablespoons all-purpose flour
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2 cups milk
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1/2 teaspoon salt, or to taste
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1/8 teaspoon freshly ground black pepper
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2 cans (4 to 6 ounces each) tuna, drained and flaked
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1 cup frozen green peas, cooked and drained
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1 cup shredded natural Parmesan cheese, or about 1/2 cup finely grated Parmesan cheese
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1 cup soft fresh bread crumbs