Step 1

Preheat oven to 350° F. Line 15 x 10-inch jelly-roll pan with foil.

Step 2

Combine flour, oats, brown sugar, 1/2 cup nuts, coconut, baking soda and 3/4 teaspoon pumpkin pie spice in medium bowl; mix well. Stir in melted butter; mix well. Press into prepared jelly-roll pan.

Step 3

Bake for 13 to 15 minutes or until slightly brown. Cool in pan on wire rack.

Step 4

Combine 2 tablespoons butter, evaporated milk, granulated sugar, pumpkin, remaining 1 1/2 teaspoons pumpkin pie spice and salt in medium, heavy-duty saucepan. Bring to a boil, stirring constantly, over medium heat. Boil, stirring constantly, for 8 to 10 minutes. Remove from heat.

Step 5

Stir in marshmallows, morsels, 1/2 cup nuts and vanilla extract. Stir vigorously for 1 minute or until marshmallows are melted. Pour over cookie base; sprinkle with remaining 1/4 cup nuts. Refrigerate until firm before cutting into bars.