1. Bring a large saucepan of water to a boil. Add spaghetti and cook until just tender, 8 to 10 minutes or according to package directions. About 3 minutes before it is done, stir in peas and garlic.
2. Meanwhile, cook bacon in a nonstick skillet over medium heat until crisp. Transfer to a paper towel-lined plate to drain. Scrape the bacon drippings into a large bowl; add eggs, 1/2 cup Parmesan, salt and pepper and whisk until combined.
3. Chop the bacon and add to the egg mixture. When the pasta and peas are done, drain, reserving 3/4 cup of the water. Immediately stir the pasta, peas and the 3/4 cup water into the egg mixture, stirring quickly so the eggs don't scramble. Let stand 5 minutes, stirring occasionally, to thicken the sauce. Serve each portion topped with 1 tablespoon of the remaining cheese.
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