If you're stuck between zesty marinara and creamy Alfredo, just ask your server for half-and-half when placing your order, but there are a couple of caveats.
If you're ordering online via Olive Garden's website or app, there's no option to mix sauces. You may only be able to make this request when dining in.
Secondly, off-menu orders allowed at one location may not be available at the next due to ingredient availability, restaurant policies, and other individualized factors.
Olive Garden is a franchise with almost 900 locations, so it's important to be understanding if your server tells you the half-and-half option is not available.
Try asking for 50/50 of the creamy mushroom and five-cheese marinara. Some guests also swear that a half-marinara, half-Alfredo dish is a possible and delicious hack.