In medium bowl, mix 1⅓ cups flour and brown sugar.
Cut in butter until crumbly.
Stir in pecans; set aside.
In separate medium bowl, beat cream cheese with electric mixer on medium speed until smooth.
Add granulated sugar and 1 tablespoon flour; beat until blended.
Add 1 egg and ½ teaspoon of the vanilla; beat until blended.
Make cake mix as directed on box, using water, oil and 2 eggs.
Spoon batter into pan.
Dollop cream cheese mixture over batter and swirl with knife.
Sprinkle reserved pecan mixture over top.
Bake 45 minutes or until set.
Cool completely on cooling rack, about 1 hour.
In small bowl, mix powdered sugar, milk and remaining ½ teaspoon vanilla with whisk.
Drizzle over coffee cake.
Notes / Tips / Wine Advice:
Make-Ahead Magic Bake and cool as directed. Wrap coffee cake tightly in heavy-duty foil; freeze up to 1 month. Thaw partially at room temperature; continue as directed