Using a food processor, grind granola and oats into a coarse flour. Add dates and coconut oil and blend until well combined. The mixture should hold together when pressed between your finger and thumb. If it seems dry, add water one teaspoon at a time until it holds together.
Press the mixture into the cups of a mini-cupcake pan or tart pans, using about one tablespoon of the mixture for each cup and pressing evenly on the bottom and up the sides. Place pans in the freezer for 15 minutes.
Use a small knife to gently release the sides of the crusts and very carefully remove them from the pan.
Fill each tart with 3 to 4 tablespoons of yogurt and arrange with a fruit of your choice on top. Serve immediately.