In a large mixing bowl, whisk butter, oil and both the sugars until well combined. Stir in the egg replacer mixture and vanilla. Mix well. Next add baking powder, baking soda and salt. Mix well.
¼ cup Unsalted Butter, at room temperature, ¼ cup Canola oil, ½ cup Granulated Sugar, ⅓ cup Light Brown Sugar, 2 tablespoons Egg replacer powder whisked in 6tbsp water (or use 2 large eggs), 1 teaspoon Vanilla extract, 1½ teaspoon Baking powder, ¼ teaspoon Baking soda, ¾ teaspoon Salt