Preheat oven to 350°.
Spray bottom of 9×5-inch loaf pan with a non-stick cooking spray. Cut a piece of parchment paper the width of the pan and large enough to extend over the short ends of the pan by 4-inches on each end. (this will help to lift the loaf out of the pan after it is baked.) Place the paper in the pan.
In a large bowl, mix together egg, sugar, oil, sour cream and banana extract. Add mashed banana and combine completely. Set aside.
In a separate bowl combine flour, baking powder, baking soda and salt. Combine the wet and dry ingredients together.
In a large mixing bowl, using your electric mixer, combine the cream cheese and sugar until creamy. Add two tbsp. of the flour and mix until smooth.
Add the remaining one tbsp. of flour to the strawberries and fold the strawberries into the cream cheese mixture.
Pour half of the bread batter into the prepared pan. Spread the cream cheese mixture on top of the batter. Top with the remaining bread batter. Even out gently.
Bake for approx. 50 minutes until a toothpick inserted into the center comes out clean.
Remove pan to a cooling rack and allow to cool completely.