Preheat oven to 350°F (180°C). Spray or brush an 8-inch (20 cm) square baking pan with vegetable oil and line bottom and sides with parchment paper, leaving overhang; set aside. Melt butter and chocolate in double boiler, stirring until smooth. Remove from heat. Mix in sugar completely then stir in eggs, one at a time. Set aside.
Using a food processor, purée beans until smooth. Stir beans into chocolate mixture until well blended. Sift together flour, cocoa and salt. Stir flour mixture into chocolate mixture; beat vigorously until batter is no longer grainy, about 1 minute.
Stir 1/2 cup (125 mL) nuts into batter and transfer to prepared pan. Sprinkle remaining nuts over top. Bake until a toothpick inserted in centre comes out clean but brownies are still slightly fudgy in centre, about 45 minutes. Transfer pan to a wire rack; let cool completely. Transfer brownies to a cutting board using parchment paper. Cut into 12 portions. Store in airtight container.
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