Step 1: Preheat oven to 350°F.
Step 2: In a large skillet, melt butter and oil, and cook onion until tender, about 3-5 minutes.
Step 3: Add potatoes, garlic, salt, and pepper, and cook for 10 minutes more, stirring frequently.
Step 4: Add chopped mushrooms, diced prosciutto (or ham), dried basil, and Italian seasoning, and cook for 5-7 minutes more or until potatoes are tender.
Step 5: Allow mixture to cool for 5 minutes.
Step 6: In a small dish, mix together dry milk with light cream until smooth.
Step 7: Add lightly beaten eggs and cream mixture to potatoes, stirring to mix well, and seasoning to taste with salt and pepper.
Step 8: Lightly oil or grease an ovenproof skillet or casserole dish.
Step 9: Pour egg mixture into pan, and bake uncovered in a preheated 350F oven for 25 minutes at 350°F.
Step 10: Remove pan from oven, and sprinkle frittata evenly with grated cheeses.
Step 11: Return to oven and bake for 15 minutes more, or until cheeses are melted and eggs are almost set.
Step 12: Preheat oven broiler to high, and cook frittata for 1-2 minutes more, or until cheese is lightly browned.
Step 13: Allow to cool slightly before slicing and serving.
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