Prep the fruit: Wash, dry, and chop fruit into bite-size pieces. Toss gently with lemon or lime juice if using.
If your fruit isn’t very sweet, add 1 teaspoon honey and stir.
Whip the cream: In a chilled bowl, beat the heavy cream with a pinch of salt until soft peaks form. Add 1–2 tablespoons sweetener and 1/2 teaspoon vanilla, then whip to medium peaks. Avoid overmixing.
Blend with yogurt: In a separate bowl, whisk the yogurt with 1 tablespoon sweetener and the remaining vanilla.
For a richer parfait, fold half of the whipped cream into the yogurt to make a light, silky base.
Set up the crunch: If using granola or crumbs, taste first. If it’s not sweet or spiced, add a pinch of cinnamon or a drizzle of honey. For extra crunch, lightly toast nuts.
Layer the parfait: In glasses or small jars, add a spoonful of the yogurt-cream mixture, a layer of fruit, and a sprinkle of crunch.
Repeat the layers until the glass is nearly full.
Top it off: Finish with a dollop of the remaining whipped cream. Add chocolate shavings, coconut, or a few pretty fruit pieces on top.
Serve or chill: Serve immediately for maximum crunch, or chill for 20–30 minutes for a more melded flavor. If chilling longer, wait to add the crunchy layer until just before serving.