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1
Preheat oven to 350; line a lightly greased 13 x 9 inch pan with aluminum foil, allowing foil to extend over ends of pan; set aside.
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2
Melt 1 cup butter in a saucepan over medium heat; remove pan from heat.
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3
Add in 6 ounces chopped chocolate, and let stand 5 minutes; stir until smooth; transfer to a large mixing bowl.
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4
Add 2 cups sugar to melted chocolate mixture; beat at medium speed with an electric mixer until blended.
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5
Add eggs, 1 at a time, beating just until blended; add vanilla.
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6
Add flour; beat on low speed just until blended; stir in 3/4 cup peanuts.
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7
Spread batter into prepared pan; bake for 30-34 minutes (wooden pick will not test clean).
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8
Remove to a wire rack, and cool completely.
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9
Meanwhile, beat peanut butter and 1/2 cup butter in a bowl at medium speed until blended.
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10
Add powdered sugar; beat until blended.
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11
Spread over cooled brownies.
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12
Melt 8 ounces chocolate squares and remaining 1 ounce chopped chocolate in a small glass bowl according to microwave package directions; stir in corn syrup.
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13
Spoon dollops of melted chocolate over peanut butter layer; spread gently to cover peanut butter layer.
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14
Sprinkle with 1/3 cup peanuts, if desired.
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15
Cover and chill 2 hours or until set.
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16
Use foil to lift brownies out of pan; peel foil away from sides of uncut brownies; cut into bars.
