http://recipeland.com/recipe/v/Be-My-Valentine-Brownie-Hearts-32435
In my opinion, this is the best brownie recipe, but they are not gooey.
For really gooey, this recipe takes the cake:
http://recipeland.com/recipe/v/Swirled-Cheesecake-Brownies-49572
Better Homes & Gardens Cook Book that I got back in 1970! I have always used it.
FUDGE BROWNIES
1/2 cup butter or margarine
1 cup granulated sugar
1 tsp vanilla
2 eggs
2 1-ounce squares unsweetened chocolate, melted and cooled
3/4 cup sifted all-purpose flour
1/2 cup chopped walnuts
Preheat oven to 350 degrees.
In medium saucepan melt butter and chocolate. Remove from heat; stir in sugar. Blend in eggs one at a time. Add vanilla. Stir in flour and nuts; mix well. Spread in greased 8x8x2-inch pan. Bake at 350 degrees for 30 minutes. Be careful not to overbake. Cool. Cut into 16 squares.
I found the absolute best chocolate brownie recipe. They are extra gooey and decadent:
http://how2heroes.com/videos/dessert-and-baked-goods/omg-brownies
They are called OMG brownines because you can't eat them without saying OMG! And there is an instructional video that goes along with the recipe and teaches you how to make them.