Chewy Butterscotch Nut Bars in a Jar

1/2 cup butterscotch chips1/2 cup pecan pieces, toasted and cooled*1/2 cup light brown sugar, packed**1 cup buttermilk biscuit baking mix1/2 cup dark brown sugar, packed**1 cup buttermilk biscuit baking mixIn 1-quart wide-mouth glass jar, gently layer and pack ingredients in the order listed, beginning with butterscotch chips. If there is any space left after adding the last ingredient, add more butterscotch chips or pecans to fill the jar. Place lid on top. Cut an 8-inch circle of fabric to cover lid; secure in place with a ribbon or raffia. Decorate as desired.Make gift card to attach as follows:Chewy Butterscotch Nut BarsPreheat oven to 350 degrees F.Empty contents of jar into medium bowl. Stir in:1/2 cup (1 stick) butter or margarine, melted1 large egg1 teaspoon vanilla extractPress into an 8-inch square baking pan coated with cooking spray. Bake for 18 to 20 minutes, or until bars are light golden brown and center is almost set. Makes 16 bars.*To toast pecans, place in a microwave-safe dish and microwave on HIGH for 4 to 5 minutes, stirring every minute.**After measuring the brown sugar, crumble it between your fingers for uniform texture. Be sure to pack the brown sugar firmly in the jar to prevent the baking mix from sifting down through it.