Lightly coat the inside of a 3. 5 to 4-quart slow cooker with nonstick cooking spray.
Drain two of the cans of diced tomatoes, leaving the third can undrained.
Pour all three cans of tomatoes into the prepared slow cooker.
Add the drained, quartered artichoke hearts and the minced garlic to the slow cooker.
Stir everything together to combine.
Secure the lid and cook on the LOW setting for 6 to 8 hours or on the HIGH setting for 3 to 4 hours, until the flavors have melded beautifully.
Just before serving, cook your pasta in a large pot of salted water according to the package directions until al dente.
Drain well.
Stir the heavy cream into the tomato and artichoke sauce in the slow cooker. Replace the lid and let it stand for about 5 minutes to heat through.
Serve the creamy sauce generously over the hot cooked pasta.
Garnish with your favorite toppings like olives and cheese, if desired.