Step 1: Preheat the oven to 450 degrees F .
Step 2: Lightly grease and pam spray a large baking dish. Boil the spaghetti in half water and half broth for about 10 minutes, or until barely tender.
Step 3: Drain, reserving the broth.
Step 4: Melt half the butter in a large pan.
Step 5: Add the mushrooms and garlic seasoning lightly and cook until tender.
Step 6: Transfer the mushroom mixture out of the pan and set aside.
Step 7: Add the remaining butter to the same pan and stir in the flour, season to taste. Cook but don't brown.
Step 8: Stir in cream and 2 1/2 cups of the reserved broth. Cook, whisking regularly, until smooth and thickened.
Step 9: Remove from heat.
Step 10: Spread half the spaghetti over the baking dish. Cover with half the mushrooms and half the turkey.
Step 11: Pour over half the sauce and sprinkle with half the Parmesan cheese.
Step 12: Repeat, ending with cream sauce on top.
Step 13: Sprinkle with remaining Parmesan cheese.
Step 14: Bake 15 minutes until tetrazzini is bubbly and very lightly browned.
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