1-First Step: Make the streusel topping In a medium bowl, combine the 6 tablespoons packed light brown sugar, 1/2 cup all-purpose flour, 1 teaspoon ground cinnamon, and 1/4 teaspoon salt. Add the 4 tablespoons of cold unsalted butter cut into 1/2-inch chunks. Use your fingertips, a fork, or a pastry cutter to rub the butter into the dry mixture until it looks crumbly. Once the streusel is ready, place it in the refrigerator while you make the cake batter. Chilling it helps the topping hold its shape in the oven, which gives you that bakery-style crumb on top of the boy bait recipe.

2-Second Step: Prepare the pan and oven Preheat your oven to 375°F. Grease a 9-inch square pan well so the cake releases cleanly after baking. If you want easier cleanup, you can also line the pan with parchment paper, leaving a little overhang on two sides. That makes it simple to lift the cake out after cooling. This is a good time to set out your blueberries, milk, eggs, and softened butter. Having everything ready before mixing keeps the process smooth and helps you avoid overmixing the batter.

3-Third Step: Mix the dry cake ingredients In a separate bowl, whisk together 2 cups all-purpose flour, 2 teaspoons baking powder, and 1/2 teaspoon salt. Whisking helps spread the baking powder evenly through the flour, so the cake rises in a more uniform way. A well-mixed dry base is one of the small secrets behind a dependable coffee cake recipe. If you are baking with gluten-free flour, make sure it is a 1:1 blend designed for baking. That helps the cake keep a good crumb instead of turning dense or dry.

4-Fourth Step: Cream the butter and sugar In a large bowl, beat the softened 1/2 cup unsalted butter and 3/4 cup granulated sugar until creamy and light. This step adds air to the batter, which helps the cake rise and stay tender. Beat long enough that the mixture looks fluffy, but stop before it gets greasy or separated. Add the 2 large eggs one at a time. After each egg, scrape down the bowl so everything mixes evenly. This small habit keeps the batter smooth and helps avoid pockets of butter or sugar at the bottom of the bowl.

5-Fifth Step: Add flavor and liquid Mix in 1 1/2 teaspoons vanilla extract and 1 teaspoon packed lemon zest from 1 lemon. The vanilla gives warmth, while the lemon zest adds a fresh note that makes the blueberries taste even brighter. Together, they give this blueberry boy bait cake its classic homemade flavor. Now, add the flour mixture and 1/2 cup milk alternately on low speed. Start with a portion of the dry ingredients, then add some milk, then repeat until everything is just combined. This gentle method keeps the cake soft and helps avoid a tough crumb.

6-Sixth Step: Fold in the blueberries Gently fold in 2 cups fresh blueberries with a spatula. Try not to stir too hard, because rough mixing can burst the berries and turn the batter purple. If you are using frozen blueberries, add them straight from the freezer without thawing so they do not stain the batter too much. If you want a slightly sweeter top layer, you can toss the berries lightly with a spoonful of flour before folding them in. That can help them stay suspended in the batter instead of sinking to the bottom.

7-Seventh Step: Assemble and bake Spread the batter evenly into the prepared 9-inch square pan. Take the streusel from the refrigerator and sprinkle it generously over the top. Press it down very lightly if needed, but do not pack it in. You want a loose, crumbly top that bakes into a crunchy layer. Bake for 40 to 45 minutes, or until the top is golden and a tester inserted in the center comes out clean. Ovens can vary a bit, so start checking near the 40-minute mark. If the top browns too quickly, you can loosely cover it with foil for the last few minutes.

8-Eighth Step: Cool and serve Let the cake cool in the pan for 20 minutes before serving. This resting time helps the structure settle, so the squares cut more neatly. The cake is delicious warm, but it also tastes great at room temperature with coffee, tea, or milk.