Preheat oven to 350°F. Combine chocolate, eggs, sugar, oil, vanilla and salt in large mixing bowl; mix to combine. Add flour and baking powder to chocolate mixture; mix until incorporated.
Add Ground Beef to food processor container. Pulse on and off for 30 seconds until beef is broken into small pieces. Add beef and walnuts to chocolate mixture; stir to combine.
Coat 8 x 8-inch glass baking pan with cooking spray. Pour chocolate mixture into prepared pan; spread evenly. Bake in 350°F oven 25 to 30 minutes or until set. Cool to room temperature before serving.
Nutrition information per serving: 333 Calories; 190.8 Calories from fat; 21.2g Total Fat (4.3 g Saturated Fat; 0.2 g Trans Fat; 10.5 g Polyunsaturated Fat; 4.9 g Monounsaturated Fat;) 58 mg Cholesterol; 187 mg Sodium; 31 g Total Carbohydrate; 0.9 g Dietary Fiber; 8 g Protein; 1.4 mg Iron; 146 mg Potassium; 1.6 mg NE Niacin; 0.1 mg Vitamin B6; 0.7 mcg Vitamin B12; 1.7 mg Zinc; 9.7 mcg Selenium; 55.5 mg Choline.
This recipe is an excellent source of Vitamin B12; and a good source of Protein, Niacin, Zinc, Selenium, and Choline.