Recipe - Peanut Butter-Fudge Marble Cake

1 pack Fudge Marble Cake Mix; (
18.25 to 19.75 Oz)
3 lg Eggs
1/3 cup Vegetable Oil: PLUS
2 tablespoon Vegetable Oil; Divided
Water
1 cup Peanut Butter Chips; Reese's

Preheat the oven to 350 degrees F. Grease and flour two 8 or 9inch round
baking pans. Prepare the cake batters according to the package directions
using the eggs, 1/3 cup of oil and water. In the top of a double boiler,
over hot NOT boiling water, melt the peanut butter chips with the remaining
2 Tb of oil, stirring constantly, OR in a small microwavesafe bowl, place
the chips and oil, then microwave on HIGH (100%) for 45 seconds, stirring
if necessary. If necessary, microwave on HIGH (100%) for an additional 15
seconds or until melted and smooth when stirred. Gradually add the peanut
butter to the vanilla batter, blending well. Pour the peanut butter batter
into the prepared pans. Randomly place spoonfuls of the chocolate batter on
top and swirl in as directed on the cake package. Bake for 30 to 40 minutes
or until a wooden pick inserted in the center comes out clean. Cool 15
minutes, in the pans, on a wire rack then remove from the pans and cool
completely. Frost as desired.