A rich caramel filling is sandwiched between classic homemade vanilla wafers and the combo is out of this WORLD! These vanilla wafer caramel sandwich cookies are a must try.
In a large bowl with a handheld electric mixer, beat butter and sugar on medium speed until completely creamy. Beat in egg yolk, and vanilla until smooth. Add salt, baking powder, and flour and beat until a dough forms.
Divide dough in half and form each half into about a 6-in log. Wrap each log in plastic wrap and refrigerate 2 hours until firm.
Preheat oven to 350F. Line two baking sheets with parchment paper. Remove logs from refrigerator, unwrap, and slice into 1/4-in thick cookie discs. Place cookies 2-in apart on prepared baking sheets.
Bake cookies at 350F 9-11 minutes or until a light golden brown. Cool cookies on sheet 5 minutes, then transfer to a wire cooling rack to cool completely.
In a medium saucepan over medium-high heat, melt butter then whisk in sugar, cream, and salt. Bring sauce to a simmer and stir 2 minutes until thickened and golden. Reduce heat to medium and add 1 tablespoon cream, and salt. Remove from heat and cool slightly (about 10 minutes) Once caramel is cooled, whisk in remaining cream and powdered sugar until a thick creamy filling forms.
Place about 2 teaspoons caramel filling on the bottoms of half of vanilla wafers. Top each with remaining cookies to form a sandwich cookie. Serve cookies and enjoy!
Recipe slightly adapted from Williams Sonoma.