Preheat the oven to 180 degrees C and grease and line a 9x9in baking tin.
Place the bananas, nut butter and vanilla in a blender and whizz up until smooth.
Add the oats, flour, Natvia, flaxseed and baking powder and blend again to form a smooth and slightly thick batter.
Fold in the strawberries then pour the mixture into the tin and smooth out evenly. Sprinkle over 2 extra tablespoons of oats over the top. Bake for 30 minutes until risen, golden and firmed up. Leave to cool in the tin then cut into 8-12 bars.
Heat up the coconut oil, nut butter and Natvia then drizzle over each bar. Now enjoy!