Avocado toast seems to be here to stay and while I don't have a problem with that, I prefer making it at home (for a lot less $). This spicy avocado toast is pretty basic, but grilling the bread with chili flakes is definitely a step above basic. I think that kick is what all our avocado toasts are missing!
Preheat grill to medium-high heat. In a small bowl combine olive oil and crushed red chili peppers. Brush oil mixture on one side of bread slices. Brush to edges of each slice. First couple of slices won't have many chili flakes, so reapply as needed. Grill oil-side down until grill marks appear (5-8 minutes). Flip. Grill 2-3 minutes to warm under side.
Meanwhile, combine avocado cubes, salt, and pepper in small bowl. Use a fork to mash it to desired consistency.
Divide avocado mixture on grilled bread. Top with lemon zest and more chili flakes if desired. Serve immediately.*
*If making ahead of time, grill toasts and let cool completely on wire rack. Mix avocado and top toasts just before serving.