In a large mixing bowl, whisk flour, baking powder, spices and salt together.
In another bowl, mix together butter, egg and vanilla. Next, stir in banana, maple syrup and yoghurt and mix until thoroughly combined.
Add the flour mix to the wet ingredients and stir until incorporated. Fold in strawberries.
Evenly divide the muffin batter between cups. Cook for approximately 20 minutes or until a skewer comes out clean after being inserted into middle of muffin.
Leave to cool for 5 minutes before removing from cup and leaving to cool completely on board or wire rack.