Lightly spoon flours into dry measuring cups; level with a knife. Combine flours, sugars, baking powder, and salt in a large bowl; stir with a whisk. Make a well in center of mixture. Combine milk and next 4 ingredients (through vanilla); add to flour mixture, stirring just until moist.
Spoon batter into 12 muffin cups coated with cooking spray. Fill each cup half full with batter. Spoon 1 teaspoon jam into each cup. Spoon remaining batter on top to cover jam. Bake at 400° for 20 minutes or until muffins spring back when touched lightly in center. Let cool in pan 5 minutes. Remove from pan, and cool on a wire rack.
1 pint each vanilla chocolatechip, chocolate and vanilla fudge ice cream
1 cup heavy cream
1/4 cup confectioners’ sugar
1 ounce semisweet chocolate, grated (optional)
Line a 9-inch square baking dish with two 24-inch sheets of plastic wrap, allowing excess to hang over sides. Arrange 9 cookies in pan and 3 cookies standing up along each side.
Warm peanut butter in microwave for 30 seconds; drizzle 1/4 cup on cookies in pan. Spoon chocolate-chip ice cream on top and cover with 8 cookies. Repeat layering twice with 1/4 cup peanut butter, a pint of ice cream and more cookies.
Cover with overhanging plastic wrap and press down to compress layers. Cover with second sheet of plastic and freeze for at least 3 hours and up to 1 week.
To unmold, dip pan into warm water, unwrap cake and invert a platter on top. Flip cake over and remove pan and wrap. Return cake to freezer.
Whip cream and confectioners’ sugar until stiff. Spread on cake and sprinkle with chocolate, if desired.