Mix concrete: Use your spoon to mix your DIY concrete to the right consistency! Follow the instructions on the back of your package to get the ratio of water to powdered concrete mix just right.
Shape it: You want the doily to take on the shape of the cup as it dries, so feel free to adjust the doily and cinch it inwards to rest on the sides of the cup.
Remove from mold: When your doily has dried thoroughly and all the way through, turn the whole thing over and carefully pull the yogurt cup out from underneath or inside the doily’s new shape.