How to Make It
Preheat oven to 325°F.
Combine oats, walnuts, cinnamon, and salt in a large bowl. Combine honey and almond butter in a small microwave-safe bowl. Microwave at high 20 to 30 seconds; stir until smooth. Add honey mixture and egg white to oat mixture; toss to coat. Divide oat mixture evenly among 8 muffin cups coated with cooking spray. Using a piece of parchment paper (to prevent sticking), press oat mixture into bottom and up sides of each muffin cup. Bake at 325°F for 15 minutes or until edges are browned and crisp; cool completely in pan.
Carefully run an offset spatula or butter knife around edges to loosen granola cups; remove from pan. Fill each cup with about 1/4 cup yogurt, and top with about 1/4 cup berries. Sprinkle with grated lemon rind, if desired.