01 - Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or grease lightly.
02 - In a small bowl, combine softened cream cheese, granulated sugar, egg yolk, and vanilla extract. Mix until completely smooth and set aside.
03 - In a large mixing bowl, whisk together all-purpose flour, granulated sugar, baking powder, baking soda, and salt.
04 - In another bowl, beat eggs, milk, vegetable oil, and vanilla extract until well blended.
05 - Add the wet ingredients to the dry ingredients. Stir gently until just combined; do not over-mix.
06 - Toss diced strawberries with 1 tablespoon flour to coat evenly.
07 - Gently fold the floured strawberries into the batter, ensuring even distribution.
08 - In a small bowl, combine all-purpose flour and granulated sugar. Stir in melted butter until a crumbly texture forms.
09 - Spoon muffin batter into each prepared cup, filling about halfway. Place approximately 1 teaspoon cream cheese filling into the center of each. Cover with remaining batter.
10 - Sprinkle crumb topping generously over each portion of batter.
11 - Bake for 18 to 22 minutes until muffins are golden brown and a toothpick inserted into the muffin portion (avoiding the filling) emerges clean.
12 - Allow muffins to cool in the tin for 5 minutes, then transfer to a wire cooling rack to cool fully before serving.