1
: Preheat oven to 350°F (180°C). Grease and line 9” x 13” (3 L) baking dish with parchment paper, overlapping the two longer sides for easy removal.
2
: Base: Combine oats, flour, sugar and melted butter in a large mixing bowl. Mix well. Press mixture into prepared baking dish. Bake in preheated oven 15 to 18 minutes until golden.
3
: Filling: Pour sweetened condensed milk over hot base. Sprinkle with remaining ingredients.
4
: Return to oven and continue baking, 25 to 30 minutes, until golden and bubbly. Chill about 4 hours or overnight before cutting into squares.