Graham Cracker Crumb Coffee Cake

Stir together the flour, baking powder, soda and salt; mix with crumbs.

Set aside.

In large bowl, cream butter and sugars. Beat in eggs (one at a time) and vanilla; beat until fluffy.

Add flour mixture to egg mixture alternately with buttermilk, beating just to blend.

Stir in walnuts; spread in greased 8 x 11-inch pan.

Bake in preheated oven at 350° for 40 to 50 minutes, or until pick inserted in center comes out clean.