Italians know that plums and almonds produce together a flavor that is, well, plumb delicious.
Simmer 1/2 cup water and sugar in a small saucepan over medium-low heat, stirring often until sugar dissolves. Cool slightly, then add almond extract.
Place plums in a medium bowl and pour syrup over fruit. Chill at least 2 hours or up to 1 day. Remove plums and set aside.
Gently fold yogurt into syrup. Spoon into serving dishes alternating plums and yogurt mixture.
Garnish each serving with cookie crumbs.
*Note: Amaretti cookies are an almond flavored meringue. If you're unable to find them in your local grocery store, you can substitute with meringues or graham crackers.