The Best Fudgy Homemade Brownies

Bahan-bahan (18 porsi)

• 3 sticks unsalted butter (1.5 cups)
• 12 ounces semisweet chocolate chips, divided
• 2 tablespoons vegetable or canola oil
• 2 cups granulated sugar
• 1/2 cup light brown sugar, lightly packed
• 6 large eggs
• 1 tablespoon vanilla extract
• 1 teaspoon instant coffee granules
• 1 cup all-purpose flour
• 1 cup Dutch processed cocoa powder
• 2 teaspoons cornstarch
• 1 1/2 teaspoons salt