Whisk or sift together 1-1/2 cups unbleached all-purpose flour, 2 teaspoons baking powder, 1/2 teaspoon salt, and 2 tablespoons granulated sugar in a large bowl.
Add 2 large eggs, 1 teaspoon vanilla extract, 1 tablespoon grated rind from two small oranges, ⅔ cup orange juice , and 1/4 cup butter to flour mixture. Stir with a spoon just until mixed. Carefully fold in 1/2 cup pecans, toasted and chopped .
Cook on a preheated waffle iron according to manufacturer's instructions.