Grease an 8x8 or 9x9 square baking pan with coconut oil and then press a sheet of parchment paper (not wax paper) on top. This will make it really easy to remove the bars once frozen. Set aside.
In a large bowl, mix together the rolled oats, tahini, maple syrup, teaspoon of vanilla extract, and a pinch of salt until well combined.
Firmly press the oat mixture into the parchment paper into a somewhat even layer. You want it to be well packed so it holds together.
In a medium bowl, whisk together the yogurt and maple syrup until combined then pour onto the granola base. Spread it into an even layer, lightly press your fruit into the yogurt layer, and place the pan in the freezer for at least 2 hours or until the yogurt is frozen solid.
The easiest way to cut the bars is to run a sharp knife under hot water and wipe the excess water with a damp cloth. For clean slices, wipe the blade after each cut.
Store the granola yogurt bars in an airtight container in the freezer until ready to enjoy. Avoid leaving the yogurt bars at room temperature for too long or they'll melt pretty quickly.