Microwave chocolate squares in a small microwave-safe bowl at MEDIUM (50% power) for 30-second intervals until melted (about 1 1/2 minutes total time). Stir chocolate until smooth.
Beat butter and sugar at medium speed with an electric mixer until light and fluffy.
Add eggs, 1 at a time, beating just until blended after each addition.
Add melted chocolate, beating just until blended.
Add flour and salt, beating at low speed just until blended. Stir in vanilla, 1/2 cup pecans, and 1/2 cup chocolate morsels.
Spread batter into a greased and floured 13- x 9-inch baking pan.
Sprinkle with remaining 1/4 cup pecans and 1/4 cup chocolate morsels.
Bake at 350 for 40 minutes or until set. Cool completely on a wire rack.
Note: Freeze brownies in an airtight container up to 1 month.
Double Chocolate Brownies With Caramel Frosting: Prepare Double Chocolate Brownies as directed. Melt 3/4 cup butter in a large saucepan over low heat. Stir in 2 cups sugar, 1/2 cup buttermilk, 12 large marshmallows, 1 tablespoon light corn syrup, and 1/2 teaspoon baking soda. Cook over medium heat, stirring occasionally, 20 to 25 minutes or until a candy thermometer registers 234 (soft-ball stage).
Remove from heat, and pour mixture immediately into a large mixing bowl. Beat mixture with an electric mixer at high speed 5 minutes or until mixture thickens and begins to lose its gloss.
