Step 1: Preheat and Prep
Preheat your oven to 350°F (175°C). Grease and flour a 9×5-inch loaf pan, or line with parchment paper leaving overhang on the long sides for easy removal.
tep 2: Make the Streusel
In a small bowl, combine flour, brown sugar, and cinnamon. Add cold butter cubes and cut in using a pastry blender, two forks, or your fingertips until the mixture resembles coarse crumbs. Set aside in the refrigerator.
Step 3: Make the Cream Cheese Swirl
In a small bowl, beat together cream cheese, sugar, egg yolk, and vanilla until smooth. Set aside.
Step 4: Prepare the Blueberries
In a small bowl, toss the blueberries with 1 tablespoon flour until coated. This simple step prevents them from sinking to the bottom of the loaf.
Step 5: Make the Loaf Batter
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In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
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In a large bowl, beat butter and sugar together until light and fluffy, 2-3 minutes.
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Add eggs one at a time, beating well after each addition. Scrape down the bowl as needed.
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Beat in vanilla extract.
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With the mixer on low, add the flour mixture in three additions, alternating with sour cream in two additions, beginning and ending with flour. Mix just until combined—do not overmix.
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Gently fold in the flour-coated blueberries.
Step 6: Layer and Swirl
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