Chocolate-Peanut Butter Terrine with Sugared Peanuts

Spray an 8 1/2-by-4 1/2-by-2 3/4-inch loaf pan with nonstick spray. Line the sprayed pan with plastic wrap, allowing a 1 1/2-inch overhang on all sides. In a stainless-steel bowl, combine the chocolate, butter, and peanut butter. Place the bowl over a pan of simmering water, making sure the bottom of the bowl does not touch the water. Heat, stirring occasionally, until the chocolate and butter melt. Remove from over the heat and whisk until smooth. Combine the egg yolks and sugar in the bowl of a stand mixer fitted with the whip attachment and whip on high speed until thick, about 1 minute. Remove the bowl from the mixer stand. Using a wooden spoon, stir in the chocolate mixture in 3 equal additions. The mixture will be quite thick. In a separate bowl, whisk the cream until it starts to thicken. Using a spatula, fold the cream into the chocolate mixture in 4 equal additions. Spread the batter in the prepared pan. Cover with the plastic wrap overhanging the sides and refrigerate until firm, at least 4 hours. To unmold the terrine, fold back the plastic wrap and invert the pan onto a wire rack. Pull on a corner of the plastic wrap to release the terrine from the pan. Lift off the pan and carefully remove the plastic wrap. Line a baking sheet with parchment paper and place the rack in it. Return the terrine to the refrigerator while you make the glaze.