Preheat the oven to 350F.
Line a 9x13-inch pan with foil using the flip-and-shape method, then grease the foil.
Crush the Altoids in a ziplock bag with a rolling pin until you have a mix of powder and small chunks.
Melt the chopped chocolate and the butter in a large bowl over simmering water, stirring until smooth.
Whisk the oil into the melted chocolate mixture.
In a separate bowl, whisk the granulated sugar, brown sugar, and eggs for 1 minute until pale and frothy.
Stream the warm chocolate mixture into the egg mixture while whisking constantly until glossy.
Whisk together the flour, cocoa powder, baking powder, the salt, and the espresso powder in another bowl.
Fold the dry ingredients and the crushed Altoids into the chocolate mixture just until combined.
Pour the batter into the prepared pan and smooth the top.
Bake for 30-35 minutes until a toothpick shows moist crumbs but not wet batter.
Let the brownies cool completely on a wire rack, at least 4 hours or overnight.
Lift from the pan using the foil and cut into squares.