Preheat oven to 350°F (176°C) and line tray with parchment paper.
In a small bowl, mix yeast, water, oil and sugar together. Set aside for 5 minutes.
Mix white and whole wheat flours and salt together in large bowl and add yeast mixture. Gently kneed just until dough forms.
Divide dough into 6 pieces and cover with plastic wrap. Let rise in warm place for 20 minutes until dough has doubled in size.
To create filling, mix mashed banana, honey, cinnamon and sunflower seeds together. Set aside.
Stretch each piece of dough into a 6-inch circle and divide banana filling evenly amongst them.
Fold the dough in half and seal edges to create turnovers and place on lined tray.
Bake for 15–20 minutes.
6 servings