In
large bowl, beat butter, sugar, eggs, and vanilla until light and
fluffy. Combine the flour, cocoa, baking soda, and salt; stir into the
butter mixture until well blended. Mix in the chocolate chips and
walnuts. Drop by rounded teaspoonfuls onto ungreased cookie sheets.
Bake
for 8 to 10 minutes in the preheated oven, or just until set. Cool
slightly on the cookie sheets before transferring to wire racks to cool
completely.
Position
rack in center of oven and preheat to 375°F. Wrap outside of
10-inch-diameter springform pan with heavy-duty foil. Combine all
ingredients in processor. Blend using on/off turns just until crumbs are
moist. Press crumb mixture firmly onto bottom and 2 inches up sides of
prepared pan. Bake until crust begins to brown, about 8 minutes.
Transfer crust to rack and cool. Maintain oven temperature.
Make filling:
Using
electric mixer, beat cream cheese and sugar in large bowl until will
blended. Beat in flour. Add eggs 1 at a time, beating just until
combined. Beat in sour cream, milk and vanilla. Pour filling into crust.
Place
springform pan in large roasting pan. Pour enough hot water into
roasting pan to come 1 inch up sides of pan. Bake cheesecake until just
set in center and top is slightly puffed and golden brown, about 1 hour.
Turn off oven; keep door closed. Let cheesecake stand in oven 1 hour.
Remove cheesecake from roasting pan. Refrigerate until cold, at least 6
hours. Cover; refrigerate overnight.
Make topping:
Stir
blueberry spread in large skillet over low heat until melted. Remove
from heat. Add blueberries; toss to coat. Spoon blueberry mixture over
top of cake, spreading evenly. Chill until cold, at least 1 hour and up
to 4 hours.
Run small sharp knife around sides of cake to loosen. Release pan sides. Transfer cake to platter. Cut into wedges.