1. Preheat oven to 400°F. Line a rimmed baking sheet with foil.
2. In a bowl, toss shrimp with 1 Tbsp. oil; season with salt and pepper. Spread in a single layer on baking sheet and roast until just cooked through, 3 to 5 minutes. Transfer to a bowl; let cool slightly.
3. Add beans, tomato, onion and cilantro to bowl with shrimp. Whisk remaining 2 Tbsp. oil, lime juice and crushed red pepper in a bowl. Pour over salad; toss to combine. Fold in avocados. Season with additional salt and pepper, if desired.