Since you are willing to use sweetened condensed milk, I will post the recipe for Nigella Lawson's Breakfast Bars.
They are delicious and so easy.
1 14-fl-oz can condensed milk
2 1/2 cups rolled oats (not instant)
1 cup shredded coconut
1 cup dried cranberries
1 cup mixed seeds (pumpkin, sunflower, sesame)
1 cup natural unsalted peanuts (I use almonds or walnuts instead, I also add some salt. )
I also add chcolate chips.
Her instructions were slightly different, but I have been making these for years so I will give mine.
Preheat the oven to 250 degrees. Line a 9x13 with parchment.
mix all the dry ingredients in a bowl.
Pour milk over ingredients and mix well with a silicone scraper spoon or whatever works for you, but these work the best. She said to warm the milk, but I never do. I found it not necessary and it melted my chocolate.
Spread the mixture into the pan and press down with a spatula or, better still, your hands to make the surface even.
Bake for 1 hour. Let cool for about 15 minutes, cut into four across and four down, to make 16 chunky bars. Let cool completely.
Makes 16
Easy!