Bring water to a boil for cooking pasta.
Place ricotta, parmesan, butter, 1/4 teaspoon salt, and 1/2 teaspoon pepper in a very large bowl.
Fry bacon until crisp in olive oil, drain & transfer to plate lined with paper towels. Add onion to pan & cook until lightly golden, add garlic & cook until fragrant (about 1 minute). Transfer onion mixture to bowl with ricotta mixture.
Meanwhile, add 1 teaspoon salt & pasta to boiling water. When pasta is about 1 minute shy of dente, add peas & cook for 1 minute more. Reserve 1 cup of pasta water, drain pasta && peas. Add pasta & peas to bowl & toss to coat, adding reserved liquid if needed. Stir in crisp bacon & adjust seasoning with salt & pepper to taste.
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