Drop the ravioli into a pot of well-salted boiling water and set a timer for the cooking time indicated on the package.
Meanwhile, heat the olive oil and butter in a large saute pan. Once it starts to bubble, add in the blueberries and cook for a couple minutes until the blueberries start to melt a little.
When the ravioli are done, lift them out of the water with a slotted spoon, not letting them drain too much (a little bit of pasta water will add thickness to the pan sauce), and add them to the blueberry pan sauce. Toss them around carefully, allowing them to get coated and to cook in the sauce for a minute.
Sample the pan sauce; it should be slightly sweet. If it’s too sweet, add more olive oil and butter to taste. Add salt to taste.
Serve immediately with grated Parmesan cheese on top.