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Step 1
Preheat oven to 350°F (180°C). Line a 13x9-inch baking pan with parchment paper, letting excess extend over sides of pan.
Step 2
In the top of a double boiler, combine chocolate chips and butter. Cook over simmering water, stirring occasionally, until chocolate is melted and mixture is smooth. Turn off heat, and whisk in sugars. Remove from heat, and let cool for 15 minutes.
Step 3
In a medium bowl, whisk together flour, cocoa, and salt. Set aside.
Step 4
Add eggs to chocolate mixture, whisking until combined. Whisk in vanilla. Fold flour mixture into chocolate mixture until only a few bits of flour remain. Fold in sourdough discard until well combined. Fold in 1 cup (170 grams) chopped chocolate and 1 cup (113 grams) pecans. Spread batter into prepared pan.
Step 5
Bake until a wooden pick inserted in center comes out with a few crumbs, about 38 minutes. Remove from oven, and sprinkle with remaining ½ cup (85 grams) chopped chocolate and remaining ¼ cup (28 grams) pecans. Bake until chocolate is melted, about 2 minutes more. Let cool completely in pan. Using excess parchment as handles, remove from pan, and cut into squares.