Peanut Butter Truffle Brownies:

Heat oven to 350 degrees Fahrenheit

BASE: Make your brownies..either the homemade recipe below or from the box..
This homemade Recipe will come out Cake Like..mine does anyways.. Yeilds 25 brownies...

1 cup and 1 tablespoon butter melted
2 cups and a 1 tblespoon white sugar
2 teaspns vanilla extract
5 eggs
1 cup and 1 tblespoon flour all purpose
2/3 cup and 1 teaspoon unsweetened cocoa powder
3/4 tspn baking powder
3/4 tspn salt

Oven should be at 350.
Grease an 8 inch square pan ( I sometimes use a larger pan)
Large bowl blend in melted butter, sugar and vanilla. Beat in eggs one at a time and combine the flour, cocoa,  baking powder and salt. Gradually blend into the egg mixture. Spread the batter into the prepared pan. 
Bake in preheated oven for 40-45 minutes or until Brownies pull from the side of the pan. Let Brownies cool and cut up and enjoy..
NOTE: it does not take mine 40-45 minutes to get done.. sometimes less check them in 30 minutes or so ;) Cuz I use a larger pan I think so more thinned out.
Now go to the instructions below while that is cooling :)

Bake the Base above and let it
Cool this base for ONE HOUR before doing the rest below...

Filling:
 1/2 cup butter Softened
1/2 cup creamy Peanut Butter
2 cups Powdered Sugar
2 Teaspoons Milk

Topping:

1 cup Semisweet Chocolate Chips
1/4 cup Butter

IN a medium bowl beat the Filling ingredients with an electric mixer on Medium Speed. until smooth.  Spread evenly over the brownie base...

In a microwavable Bowl microwave the topping ingredients on HIGH 30-60 seconds.. stir until smooth.. cool for 10 minutes.. spread the filling over the brownies and filling..
Refrigerate this whole thing for 30 minutes or until set.. then take out and cut up and enjoy! :)

NOTE:

Other Homemade Brownie Recipes you can use with this:

Fudgey Chocolate Brownies
Heat Oven at 325 degrees  Use an 8x8 Square Greased pan

3/4 cup flour
1/4 teaspn baking powder
4-1/2 tablespn butter
9 tablespn unsweetened cocoa
3/4 cup granualated sugar
1/3 cup brown sugar
2 large eggs
2 tspn vanilla extract

Place oven rack on lower third of oven

Mix flour and baking powder.  Melt butter in a saucepan, stir in the cocoa, sugars and cool.
Add Eggs and vanilla to saucepan and mix
Add flour and stir till smooth
Pour into the greased prepared pan
Bake for 15 minutes.. stick a toothpick and/or knife and it WON'T Come out clean!
They are done :)
And then use the Topping and Filling Recipes for this one :)