Caramel Brownies

1 cup all-purpose flour
1/2 cup unsweetened cocoa powder
1 teaspoon baking powder
1/4 teaspoon salt
1 1/2 cups granulated sugar
3/4 cup unsalted butter (at room temperature)
4 eggs
1 teaspoon vanilla extract
1 cup chocolate-covered caramels (about 24),
    unwrapped and halved
Confectioners