Peanut Tunnel of Fudge Cake

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For the cake:

Nonstick cooking spray

2 1/4 cups all-purpose flour 

2 cups honey-roasted peanuts 

2 tablespoons peanut butter powder (optional) 

4 large eggs plus 2 egg yolks 

2 1/2 sticks unsalted butter, cut into pieces, at room temperature 

1 1/2 cups granulated sugar 

3/4 cup packed dark brown sugar 

1/3 cup roasted peanut oil 

1 teaspoon pure vanilla extract 

1/2 teaspoon kosher salt

1 1/2 cups confectioners' sugar

3/4 cup unsweetened cocoa powder

For the glaze:

1 1/2 cups confectioners' sugar

3 tablespoons milk 

1/4 cup creamy peanut butter

1 teaspoon pure vanilla extract

1/4 teaspoon kosher salt