Preheat your oven to 350°F (175°C). While it heats, grease your 8½ x 4½-inch loaf pan thoroughly—I use a silicone pastry brush with melted butter, making sure to coat every corner, edge, and crevice. Then lightly dust the entire interior with flour, shaking out any excess. This two-step coating prevents sticking while keeping your bread's edges clean and defined. This pan size matters—if you use a larger pan, your bread will be too shallow and overbake; smaller means it stays underbaked in the center. Your oven temperature is critical too. At 350°F, you achieve gentle, even baking that cooks the center without browning the exterior too aggressively.

In a large mixing bowl (I prefer glass so I can see through it), combine your flour, sugar, baking powder, and salt. Here's the technique moment: use a whisk, not a spoon. Whisking aerates your dry ingredients—it incorporates tiny air pockets throughout. These air pockets act as nucleation sites when leavening agents activate in the oven. More air now means more lift later. Whisk for about 20 seconds, making sure you break up any lumps of baking powder or sugar. You're not looking for a perfectly uniform color—just ensure no streaks of baking powder remain visible.

In a separate medium bowl, whisk together your milk, oil, egg, and vanilla extract. This combination creates an emulsion—oil and water don't naturally mix, but the egg yolk acts as an emulsifier, coating oil droplets in a protective layer that allows them to suspend in milk. This emulsion is what creates a tender crumb. As the egg protein denatures in the oven, it stabilizes this mixture, preventing greasiness. Whisk this wet mixture for about 15 seconds until the color is uniform and slightly lighter—you're incorporating a tiny amount of air here too. If your egg was cold from the refrigerator, your mixture might look slightly curdled. That's fine—it'll smooth out during the next step.

Pour your wet mixture into your dry mixture. Now here's what separates home bakers from skilled ones: mix just until the ingredients are barely combined. I'm talking about 10-12 gentle folds with a spatula. You should still see streaks of flour. Your batter should look lumpy and underdeveloped. Why? Flour contains gluten proteins. The more you mix after adding liquid, the more you develop gluten. Developed gluten creates chewy, dense bread. Underdeveloped gluten creates tender, crumbly bread. In sweet quick breads like this one, you want minimal gluten development. The lumps will smooth out during baking as proteins hydrate. This is the mistake most home bakers make—they mix until the batter looks smooth and uniform. Resist that instinct. Lumpy batter equals tender bread.

Pat your blueberries completely dry with paper towels—any surface moisture causes bruising. In a small bowl, gently toss your berries with cornstarch using a light hand. I use my fingers, rotating the berries in the cornstarch rather than stirring. The cornstarch creates an invisible protective coating. Now comes the signature move: fold the berries into the batter using the under-and-over motion. Spatula down through the center of the batter, along the bottom, then up and over the top. Rotate your bowl a quarter turn. Repeat. Do this 12-15 times until berries are evenly distributed. You'll see them suspended throughout rather than sitting on top or sinking to the bottom. This distribution happens because you're folding gently—you're not breaking berries apart, and you're moving slowly enough to maintain batter consistency. Here's what you should see: individual berries throughout the batter, no clusters, no bare patches. The batter should still look slightly lumpy—that's perfect.

Pour your batter into your prepared loaf pan, smoothing the top gently with an offset spatula. Don't press or compact—just level it. Now sprinkle your coarse sugar over the top in an even layer. This topping serves two purposes: visual appeal and textural contrast. The sugar won't dissolve completely into the bread; it'll create a subtle crunch that provides eating experience beyond just flavor.

Slide your pan into your preheated oven. Set a timer for 60 minutes. Do not open the oven door before 50 minutes—opening it drops the temperature suddenly and can create a dense, gummy center. At 60 minutes, check your bread with a wooden toothpick inserted into the center. If it emerges clean or with just a few moist crumbs (not wet batter), you're done. If it comes out with wet batter, bake another 5-10 minutes and recheck. The berry bread should be deep golden brown on top, and the edges should be slightly pulling away from the pan. Total baking time is usually 60-70 minutes, depending on your oven's accuracy. Every oven bakes differently—some run hot, some run cold. Over time, you'll learn your oven's personality.

Remove your bread from the oven and let it rest in the pan for 15 minutes. This resting period is crucial—it allows the crumb to set and firm up slightly. If you try to turn it out of the pan immediately, it'll fall apart. After 15 minutes, run a small knife around the edges and turn the bread out onto a cooling rack. Let it cool completely—at least 2 hours—before slicing. If you slice it while warm, you'll see it's still gummy inside. The crumb continues to set as it cools. Patience creates better texture.