Cook pasta according to package directions. Drain.
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2.
Meanwhile, preheat a nonstick skillet over medium to medium-high heat. Add olive oil and then onions, cooking until onions are translucent and beginning to soften (about 3-4 minutes).
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3.
Add bisque, ricotta, parmesan, salt, and pepper to skillet and cook until heated through. Remove from heat and stir in spinach and basil.
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4.
Serve sauce over warm penne. Alternately, you can toss the pasta right into the skillet with your tomato sauce, stir it together, and serve it homestyle, directly from the skillet.
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