Preheat the oven to 350F. Then, line a 9''x13'' brownie baking pan with parchment paper and set it aside.
Next, beat the softened butter with sugar until it is light and fluffy.
1 cup butter, 1 1/2 cups sugar
In a food processor or blender, puree frozen strawberries until they are nice and smooth. Fold the strawberry puree into the butter mixture and mix to combine. It is ok if the butter has lumps.
1 cup strawberries
Then, add one egg at a time, mixing well after each addition. Don't worry about the curdled look; it will work well afterward!
2 large eggs
Add one small drop of food coloring at a time until you get the desired look. After baking, it will look paler, so aim for a vibrant pink to get a lovely light pink in the end. Alternatively, you can also slowly add beet powder.
1 pinch red food coloring
Next, mix the flour and baking powder in a separate bowl. Then, combine it with the other ingredients. The result will be a stiff brownie batter.
2 cups all purpose flour, 1/2 tsp baking powder
Pour your batter into the prepared baking pan, and extend it evenly. Bake it for 25-28 minutes, or until an inserted toothpick comes out clean.
Once out of the oven, let the brownie cool to room temperature.
While your brownies are cooling, you can start the glaze. First, mix the powdered sugar, milk, and vanilla extract in a bowl until well combined. Start with 2 tbsp of milk, check the consistency, and then add the third tablespoon if you like a thinner glaze.