Preheat your oven to 350°F (175°C) and grease a 9x9-inch baking pan or line it with parchment paper.

In a large mixing bowl, combine the melted butter and granulated sugar. Whisk until smooth.

Add the eggs, vanilla extract, and pureed strawberries to the bowl. Mix until well incorporated.

In a separate bowl, whisk together the flour, baking powder, and salt.

Gradually fold the dry ingredients into the wet mixture until just combined. Do not overmix.

Pour the batter into the prepared pan and spread it evenly. Drop small dollops of strawberry jam over the batter and gently swirl with a knife to create a marbled effect.

Bake in the preheated oven for 25-30 minutes or until a toothpick inserted into the center comes out with a few moist crumbs.

While the brownies are cooling, prepare the frosting. In a mixing bowl, beat the powdered sugar, softened butter, cream cheese, and vanilla extract until smooth.

Add 1-2 tablespoons of milk to achieve your desired frosting consistency. If using, add a few drops of pink food coloring and mix until the color is uniform.

Once the brownies are completely cool, spread the creamy frosting evenly over the top.

Cut into squares and serve. Enjoy your delicious strawberry brownies!