Heat oven to 350°F. Line a 9x5-inch loaf pan with parchment and lightly grease.
Whisk flour, baking powder, baking soda, and salt in a large bowl.
Rub lemon zest into the sugar with your fingertips until fragrant.
Whisk the zested sugar with eggs until slightly thick and pale.
Add yogurt, oil, lemon juice, vanilla, and lemon extract. Whisk until smooth.
Fold dry ingredients into the wet mixture just until no dry streaks remain.
Stir in milk to loosen the batter to a thick, pourable consistency.
Pour batter into the pan. Smooth the top and tap to release bubbles.
Bake 48–55 minutes, until a tester comes out clean. Tent if browning early.
Cool 10 minutes in the pan, then transfer loaf to a rack to cool until barely warm.
Whisk powdered sugar with lemon juice and a pinch of zest until thick and glossy.
Spoon glaze over the loaf, letting it drip down the sides. Let set, then slice.
Notes
For a bakery-style look, glaze twice: once while warm for soaking, again when cool for a crisp finish. Swap Greek yogurt with sour cream for extra richness. Store covered at room temperature for 2 days or refrigerate up to 5 days; freeze slices well-wrapped for 2 months.This recipe is an original creation inspired by classic Easy Copycat Starbucks Lemon Loaf flavors. All ingredient ratios and instructions are independently developed.