Best Fudgy Brownies

Ingredients

• 1/2 cup (113 g) dark baking chocolate (I used 59% dark chocolate)
• 1/2 cup+2 tbsp (145 g) unsalted butter
• 1 tbsp vegetable oil (cooking oil)
• 3/4 cup all-purpose flour
• 1/3 cup unsweetened cocoa powder
• 1 &1/4 cup(250 g) granulated sugar
• 1 tsp vanilla extract
• 1/4 tsp salt
• 3 large eggs (total weight without shell=155g)
• 50 g milk chocolate chips
• 1 tsp coffee powder dissolved in 1 tbsp warm milk