Fruitcake-Inspired Brownies

Ingredients

• 3/4 cup unsalted butter, plus more for the pan
• 1 pound bittersweet chocolate, coarsely chopped
• 3/4 cup 1 tbsp. AP flour
• 1/2 teaspoon baking powder
• 1/4 teaspoon freshly grated nutmeg
• 1/4 teaspoon ground cinnamon
• 1/4 cup dried cherries
• 1/4 cup candied orange bits
• 1/4 cup dates, chopped coarsely
• 5 large eggs
• 2 cups lightly packed dark brown sugar
• 1 teaspoon salt
• 1 teaspoon vanilla extract
• 1/2 cup roasted unsalted walnuts, chopped coarsely
• 1/2 cup roasted unsalted hazelnuts, chopped coarsely
• 1 cup roasted unsalted pecans, chopped coarsely