Begin by bringing a generously salted pot of water to a rolling boil. Add the pasta and follow the instructions on the package for cooking time. Before draining, remember to save at least 1/2 cup of the pasta cooking water.
In a saucepan, add the butter and olive oil over medium heat. Add in the chopped onions and the shrimps and season with salt, pepper, and chili flakes. Cook on both sides for 2-3 minutes.
In the same pan, add in the heavy cream, crushed tomatoes and pasta water.
Season with salt, pepper, and garlic powder. Let it simmer for a bit.
Now add in the cooked pasta and mix until incorporated.
Enjoy while warm!