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In the bowl of a stand mixer, combine chocolate-butter mixture with sugar, vanilla, and eggs on medium speed for 1 minute, scraping down the sides of the bowl frequently. Mix in flour and salt and beat for 30 seconds. Scrape bowl and beat for 1 minute. Stir in chocolate chips.
Spread half of brownie mixture in a greased 13 by 9 by 2-inch pan. Pour mint filling on top of brownie batter and spread to edge. Carefully spread the other half of the brownie mixture on top of the mint filling. Bake for 40 to 45 minutes until sides pull away from pan and a toothpick inserted in the center comes out clean. Cool in pan.