adapted from 101 Cookbooks
Mix together flours, sugar, baking soda, and salt. Stir in chocolate pieces.
Separately, mix together olive oil, eggs, banana, yogurt, lemon zest, and vanilla. Pour banana mixture into flour mixture and fold with a spatula until just combined. Scrape batter into greased 9x5-inch loaf pan.
Bake at 350F for about 50 minutes, until golden brown. Cool in the pan for 10 minutes, then turn loaf out of the pan onto a cooling rack. Cool completely.
Mix together brown sugar, powdered sugar, and lemon juice until mixture is smooth. Drizzle glazes over the top of the cooled cake.