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Preheat oven to 325 degrees. Grease a 9 inch square pan.
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In a small bowl, stir together flour, baking soda, and salt.
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In a large bowl, combine chocolate chips and vanilla.
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In a saucepan, combine butter, sugar, and water. Bring this mixture just to a boil. Pour hot mixture over chips and stir. Add eggs one at a time, mixing well after each addition. Stir in the flour mixture. Fold in nuts at this time, if desired. Pour 1/2 the batter into the pan, put down a layer of the mints, and then top with the remaining batter, spreading evenly.
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Bake for 25-30 minutes, or until slightly firm to touch. Cool completely before frosting or cutting.