Preheat the oven to 350°F and line an 8x8-inch baking pan with parchment paper, letting the parchment rise up over the side for easy removal after baking. Set aside.
Wash, dry, and dice the strawberries to yield 1½ cups chopped strawberries, then set them aside.
In a large microwave-safe bowl, melt the 1 cup salted butter, then whisk in the 1 cup light brown sugar and 2 teaspoons vanilla extract until smooth.
Once the butter mixture has cooled, whisk in 1 large egg.
In a separate bowl, whisk together the 2 cups all-purpose flour, 2 tablespoons malted milk powder, ½ teaspoon baking powder, and ¼ teaspoon salt.
Stir this into the wet ingredients until completely combined, then fold in the ½ cup white chocolate chips and the 1½ cups chopped strawberries. Transfer the batter to the prepared pan.
Bake for 35 to 40 minutes. The middle may be soft but not jiggly, and the edges should be pulling away from the sides. The top should be golden when done.
Allow them to cool completely before removing them from the pan.