Strawberry Blondies

Ingredients

• 1 1/4 cups light brown sugar, packed
• 1 1/2 sticks unsalted butter, melted
• 1/4 cup granulated sugar
• 2 large eggs
• 2 teaspoons pure vanilla extract
• 1/2 teaspoon kosher salt
• 2 cups all-purpose flour
• 1 cup strawberry jam
• 1 cup powdered sugar
• 1 tablespoon whole milk, plus more, to taste
• sprinkles, optional, to taste