In a medium saucepan, melt butter and 1/2 cup chocolate chips over low heat.
Pour melted butter and chocolate chips into a mixing bowl.
Add oil, brown sugar, and white sugar to the mixing bowl and whisk together.
Add eggs, salt, and vanilla to the mixture and whisk together.
Slowly fold in flour and cocoa powder.
Fold in chocolate chips.
Pour batter into a greased baking pan.
Top with additional chocolate chips.
Bake for 30-35 minutes.
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