Big Slab Brownie Bars

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Nonstick cooking spray, for spraying the pan and parchment

3 cups all-purpose flour 

1/2 cup cocoa powder 

2 teaspoons baking powder 

1 teaspoon kosher salt 

2 cups (4 sticks) unsalted butter, at room temperature 

2 cups granulated sugar 

1/2 cup packed light brown sugar

4 large eggs 

2 teaspoons vanilla extract 

2 cups extra-dark chocolate chips 

1 1/2 cups chopped fresh cherries (or substitute frozen or drained jarred) 

Chocolate Ganache, recipe follows

Chocolate Ganache:

6 ounces dark chocolate chips

2/3 cup heavy cream