Prepare the pan. Preheat your oven to 350 degrees F. Grease a 9×5-inch loaf pan or line it with parchment paper, leaving an overhang for easy removal. Mix the ingredients. In a large mixing bowl, whisk together the whole wheat pastry flour, all-purpose flour, baking powder, baking soda, and salt until evenly combined. In a separate bowl, whisk together the Greek yogurt, eggs, melted butter, cane sugar, lemon juice, lemon zest, and vanilla extract until smooth and creamy. Combine the batter.