1.
Heat 1 tablespoon butter over medium-high in a medium nonstick skillet. Sauté onions until soft and translucent, about 3 minutes, stirring occasionally. Set aside.
2.
In a large bowl, whisk together the flours, baking soda, baking powder, salt, herbs, and cheese.
3.
In a medium bowl, whisk together the buttermilk, 2 Tbsp. melted butter, eggs, onions, and olives until combined. Add wet mixture to the dry ingredients, stirring until moist and incorporated. (Do not over-mix.)
4.
Transfer batter to the prepared loaf pan. Bake for 40-45 minutes or until the top is golden and a tooth pick (or long skewer) inserted in the middle comes out clean. Let cool in pan for 10 minutes, then transfer to a cutting board.
5.
Slice warm or at room temperature and enjoy!