How to Make It
Preheat oven to 350°.
Weigh or lightly spoon flours into dry measuring cups; level with a knife. Combine flours, baking powder, xanthan gum, and salt; stir with a whisk. Stir in feta cheese and dill; make a well in center of mixture. Combine half-and-half, olive oil, and eggs; stir with a whisk. Add to flour mixture, stirring just until moist.
Pour batter into an 8 x 4-inch loaf pan coated with cooking spray. Bake at 350° for 45 minutes or until a wooden pick inserted in center comes out clean. Cool 15 minutes in pan on a wire rack; remove from pan. Cool completely on wire rack.