Gather all ingredients.
Preheat the oven to 350 degrees F (180 degrees C). Coat an 8x4-inch loaf pan with nonstick spray and line with parchment paper.
Wash the orange and blot dry with paper towels. Cut in 8ths, removing any seeds.
Combine orange pieces, eggs, sugar, melted butter, and vanilla in a blender. Cover and blend until smooth, about 30 seconds. Add flour, baking powder, and salt. Cover and pulse just until combined and batter is smooth.
Add batter to prepared pan.
Bake until a toothpick inserted into the center comes out clean, about 45 minutes.
Cool in the pan on a wire rack 10 minutes. Remove from pan and cool completely on a wire rack.
Whisk together powdered sugar and orange juice until smooth. Drizzle over the cooled loaf.
