1-First Step: Prepare the crumble. Mix all crumble ingredients in a small bowl until crumbly, then pop it in the fridge. Chilling keeps it from melting into the batter during baking, giving you that perfect crunchy top. This takes just a couple minutes and sets you up for success.

2-Second Step: Preheat and prep the pan. Heat your oven to 350°F. Grease and line all sides of a 1 lb loaf pan (8.5×4.5 inches) with parchment. A smaller pan than the standard 9×5 gives a taller rise; light metal pans bake evenly, avoiding sunken centers from glass or ceramic.

3-Third Step: Infuse sugar with lemon zest. In a stand mixer bowl, rub granulated sugar and fresh lemon zest (from about 2 lemons) together with your fingers. This releases the oils for maximum citrus punch in every bite of your lemon blueberry loaf.

4-Fourth Step: Add dry ingredients. Mix in all-purpose flour, baking powder, and kosher salt until combined. Spoon-and-level or weigh flour to avoid packing it down, which can dry out the loaf.

5-Fifth Step: Incorporate butter using reverse creaming. With the mixer on medium-low, add room-temperature unsalted butter one tablespoon at a time. Beat until the mixture looks crumbly with no lumps. This method coats flour particles, limiting gluten for an extra-tender crumb.

6-Sixth Step: Scrape and add vanilla. Scrape down the bowl sides, then mix in vanilla extract. This ensures even flavor distribution before moving on.

7-Seventh Step: Add eggs one by one. Beat in large eggs at room temperature, one at a time, mixing just until blended. Room-temp eggs prevent curdling.

8-Eighth Step: Mix in lemon juice and milk. Pour in fresh lemon juice (from about 1 lemon), then milk at room temperature. Use low to medium-low speed and mix minimally to keep the batter tender. Overmixing develops gluten, making the loaf tough.

9-Ninth Step: Prep the blueberries. Rinse fresh blueberries, remove any stems, and toss with 1 extra tablespoon flour. This coating suspends them in the batter, preventing sinking to the bottom.

10-Tenth Step: Fold in blueberries gently. Use a spatula to fold berries into the batter until evenly distributed. Be careful not to overmix; a few streaks are okay for lightness.

11-Eleventh Step: Fill the pan. Pour batter into the prepared loaf pan and spread evenly with a spatula.

12-Twelfth Step: Add toppings. Scatter extra fresh blueberries on top, then sprinkle the chilled crumble evenly over them. Press lightly for adhesion.

13-Thirteenth Step: Bake to perfection. Bake at 350°F for 50 minutes to 1 hour. Check with a toothpick; it should come out clean with a few moist crumbs. Look for golden edges and a puffed center. If using a darker pan, tent with foil after 40 minutes to prevent over-browning.

14-Fourteenth Step: Cool the loaf. Let it cool in the pan at room temperature for about 45 minutes. This prevents crumbling when slicing.

15-Fifteenth Step: Make and apply icing. Whisk powdered sugar, milk or cream, and fresh lemon juice to a thick, glue-like consistency. Drizzle over the cooled lemon blueberry loaf, slice, and serve. For vegan, use plant milk here too.