Mix the base: In a bowl, stir the Greek yogurt with the powdered sweetener and vanilla extract, if using, until smooth.
1 tub plain whole-milk Greek yogurt, 2-3 tablespoons powdered sweetener, 1 teaspoon vanilla extract
Fill the dishes: Spoon a little yogurt into the bottom of 4 shallow dishes (about 10–12 oz each). Add a layer of Biscoff cookies to each, cover with the rest of the yogurt, then press 2–3 more cookies into the top of every dish.
24 Biscoff cookies
Chill: Cover and refrigerate for at least 6 hours, or overnight, until set and the cookies have softened. You can dig in sooner, but the cookies won't be as soft.
Serve: Drizzle each dish with a little melted Biscoff spread, if using, then spoon straight through the layers.
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