In a small bowl, combine almonds and brown sugar; set aside.
In a large mixing bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Beat in extract.
Combine flour, baking soda and baking powder; add to the creamed mixture alternately with bananas and Greek yogurt. Fold in white chocolate or vanilla chips.
Spread into a greased 13x9x2 in baking pan. Sprinkle with reserved almond mixture.
Bake at 350 degrees for 35-40 minutes or until a toothpick inserted near the center comes out clean. Cool on a wire rack.
