Make chocolate layer: Put oven rack in middle position and preheat oven to 350°F Line a 9-inch square baking pan with foil, allowing 2 inches of foil to hang over 2 opposite ends of pan, and lightly brush foil (except overhang) with oil.
Melt chocolate with butter, sugar, and salt in a double boiler or a large metal bowl set over a pan of barely simmering water, whisking occasionally, until smooth.
Remove top of double boiler or bowl from heat and whisk in eggs and vanilla, then stir in peanuts.
Pour batter into baking pan and bake until set and edges are slightly puffed, about 15 minutes.
Transfer cake in pan to a rack to cool completely.
Make peanut butter layer: Beat cream cheese, peanut butter, confectioners sugar, and salt in a bowl with an electric mixer at medium speed until combined well, about 4 minutes.
Beat cream with vanilla in a bowl with cleaned beaters at medium-high speed until it just holds stiff peaks, then gently fold into peanut butter mixture until just combined.
Spread mixture evenly on top of chocolate layer and freeze, pan covered with foil, until firm, about 2 hours.
Make hot fudge sauce: Bring cream, syrup, sugar, cocoa, salt, and chocolate to a boil in a 1-quart heavy saucepan over moderate heat, stirring until chocolate is melted.
Reduce heat and simmer, stirring frequently, until thickened, about 3 minutes, then remove from heat.
Stir in vanilla until incorporated.
Cool sauce to warm.
To serve: Carefully lift cake from pan by grasping overhang.
Trim 1/4 inch from edges of cake and discard, then cut into 8 bars.
Peel off foil and serve bars with sauce.
Cooks' notes:.
Hot fudge sauce can be made 1 week ahead and cooled completely, then chilled in an airtight container or jar.
Reheat before using.
Leftover bars can be frozen, individually wrapped in plastic wrap, up to 4 days.

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	679.27 Kcal (2844 kJ)
Calories from fat	406.55 Kcal
		% Daily Value*
Total Fat	45.17g	69%
Cholesterol	139.23mg	46%
Sodium	443.5mg	18%
Potassium	338.06mg	7%
Total Carbs	64.7g	22%
Sugars	52.67g	211%
Dietary Fiber	3.65g	15%
Protein	11.79g	24%
Vitamin C	0.1mg	0%
Vitamin A	0.1mg	5%
Iron	2mg	11%
Calcium	83.3mg	8%

Amount Per 100 g
Calories	400.07 Kcal (1675 kJ)
Calories from fat	239.44 Kcal
		% Daily Value*
Total Fat	26.6g	69%
Cholesterol	82mg	46%
Sodium	261.21mg	18%
Potassium	199.11mg	7%
Total Carbs	38.11g	22%
Sugars	31.02g	211%
Dietary Fiber	2.15g	15%
Protein	6.94g	24%
Vitamin C	0.1mg	0%
Vitamin A	0.1mg	5%
Iron	1.2mg	11%
Calcium	49.1mg	8%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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