"Proost!"
This is the most common way to say "cheers" in Dutch and is used in a variety of social situations, including toasting at a party or gathering, or simply when clinking glasses with friends or family.
When you say "Proost!", it is customary to make eye contact with the person or people you are toasting and to raise your glass towards them. You can also say "Proost" while clinking glasses, which is a common gesture of friendship and goodwill.
In some cases, you may also hear "Op jouw gezondheid!" (to your health) or "Op ons!" (to us) used as toasts in Dutch. These phrases express a similar sentiment of well-wishing and are appropriate in most social settings.
It's worth noting that the pronunciation of "Proost" is approximately "Prost" with a long "O" sound.