Brownie Cookies

1/2 cup butter
4 (1-oz) unsweetened chocolate baking squares
1 1/2 cups semisweet chocolate morsels (I used ghirardelli)
1 1/2 cups bittersweet chocolate morsels (I used ghirardelli)
1 1/2 cups all-purpose flour
1/2 teaspoon baking powder
1/2 teaspoon salt
4 large eggs
1 1/2 cups sugar
2 teaspoons vanilla extract
2 cups walnuts chopped

Combine butter, unsweetened chocolate, and 1 1⁄2 cups bittersweet chocolate morsels in a large heavy saucepan. Cook over low heat, stirring constantly, until butter and chocolate melt; cool.

Combine flour, baking powder, and salt; set aside.

Beat eggs, sugar, and vanilla at medium speed with an electric mixer. Gradually add flour mixture to egg mixture, beating well. Add chocolate mixture; beat well. Stir in 1 1⁄2 semi-sweet cups chocolate morsels and walnuts.

Drop dough by 2 tablespoonfuls 1 inch apart onto parchment paper-lined baking sheets.

Bake at 350° for 10 minutes. Cool slightly on baking sheets; remove to wire racks to cool completely.