Preheat oven at 400 degrees Fahrenheit (200 Celsius).
In a medium bowl, mash the feta with yogurt until creamy. Add the mint and olive oil and blend well.
Spread the yogurt-feta mix on each pita.
Bake in the oven for about 10 minutes, until tips of pita starts to brown.
Take out and cut each pita with a pizza cutter in 6 triangles or 8 and serve.