Preheat Oven: Preheat your oven to 350°F (175°C). Line a 9x13-inch baking pan with parchment paper, butter it, and dust with cocoa powder
Mix Dry Ingredients: In a bowl, whisk together 1.5 cups of cake flour, 3/4 teaspoon of baking soda, and 1/2 teaspoon of kosher salt.
Mix Dry Ingredients: In a bowl, whisk together 1.5 cups of cake flour, 3/4 teaspoon of baking soda, and 1/2 teaspoon of kosher salt.
Cream Butter and Sugar: In a large mixing bowl, beat 3 sticks of unsalted butter with 1 2/3 cups of sugar until light and fluffy. This should take about 3-5 minutes.
Add Eggs: Add 4 eggs one at a time, beating well after each addition. Then, add 2 teaspoons of pure vanilla extract.
Combine Mixtures: Gradually add the dry ingredients to the butter mixture in three parts, alternating with the chocolate mixture in two parts, beginning and ending with the dry ingredients. Mix until just combined.
Fold in Cherry Mixture: Fold in 1.25 cups of the cooled cherry mixture into the batter until evenly distributed.