Beat butter (3/4 cup) and shortening (1/3 cup) at medium speed with an electric mixer until creamy; gradually add sugars (1 cup sugar + 2/3 cup), beating until light and fluffy. Add eggs (2) and vanilla (2 teaspoons), beating until blended.
Combine flour (2 cups) and next 3 ingredients; gradually add to butter mixture, beating until blended. Stir in cookies (2 cups), candy bars (3 bars), and chocolate chips (1 cup). Chill the dough for 30 minutes.
Drop dough by 1/4 cupfuls (I used a large cookie scoop) 2 inches apart onto greased baking sheets.
Bake in a 350ºF (177ºC) preheated oven for 10-12 minutes or until barely set. Cool on baking sheets for 10 minutes. Remove to wire racks to cool completely.
Notes
Texture tip: The butter-shortening combo gives these cookies a soft, bakery-style crumb that lasts for days — even longer if you store them in an airtight container.
Don’t overbake: When the centers still look a bit soft, that’s your cue! Overbaking will make them dry instead of gooey.
Mix-ins made easy: Coarsely chop the Oreos and Mounds bars. The mix of textures — crunchy, chewy, melty — is what makes these cookies irresistible.
Perfect portioning: A large cookie scoop gives uniform size and even baking. These are meant to be indulgent — big, chunky, and satisfying!