Scaffolded peptidic libraries and methods of screening the same for specific binding to a target protein are provided. Each library includes distinct peptidic compounds that include a scaffold domain and a distinct variable domain. A variety of libraries are provided where each library is based on an underlying peptidic scaffold having a structural motif. In some embodiments, the peptidic scaffold is a small protein having a protein-protein interaction surface. Libraries of polynucleotides that encode a variety of peptidic compounds are provided. These libraries find use in a variety of applications in which specific binding to target molecules, e.g., target proteins is desired. Also provided are methods of making the libraries and methods of screening the libraries for binding to a target.