1Heat oven to 350°F. Grease 13x9-inch (3-quart) glass baking dish, or line with cooking parchment paper.
2In large bowl, beat Bisquick mix, sugar, milk, melted butter, vanilla and egg with electric mixer on low speed 30 seconds, scraping bowl constantly. Beat on medium speed 4 minutes, scraping bowl occasionally. Fold in 1/2 to 3/4 cup chocolate chips. Pour into pan.
3Bake 20 minutes. Spread coconut over the top in an even layer. Next layer the 1 cup chocolate chips and the butterscotch chips. Evenly drizzle condensed milk all over the top. Sprinkle with chopped pecans and walnuts.
4Bake 10 to 15 minutes longer or until top is golden brown. Cool at room temperature at least 2 hours before cutting into bars. The bars must be cooled before you cut into them, or you will get a gooey mess.