1. Preheat oven to 425°F Spray a baking sheet with nonstick cooking spray or line it with parchment paper. Melt butter in a small saucepan over low heat and cook until it begins to turn light brown, about 2 minutes. Skim foam and pour into a small bowl.
Stir together oats, flours, sugar, baking powder, baking soda and salt in a large bowl. Stir in raisins and make a well in the center of the dry ingredients. Combine the browned butter, egg, yogurt and oil in a small bowl; add to the dry ingredients, stirring just until moistened.
Turn out onto a lightly floured surface and gently knead several times to form a ball. Pat the ball into an 8-inch circle and cut into 8 or 12 wedges (depending on the size you want).
Place the wedges on the prepared baking sheet and bake until lightly browned and firm to the touch, about 12 minutes. Transfer to a rack and let cool slightly. Serve warm.