Most croutons are made from stale white bread, which is nearly devoid of resistant starch and fiber. Here, youï¿½ll use rye bread instead, for an extra dose of RS.
Combine first 3 ingredients in a small bowl, stirring with a whisk.
Combine arugula, tomatoes, and beans in a large bowl. Add dressing; toss gently. Top with rye bread croutons and cheese.