Polenta Rounds with White Bean Puttanesca

Name: Polenta Rounds with White Bean Puttanesca
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 1/2 onion, chopped; 2 Tbsp olive oil, divided; 1 (15-oz) can low-sodium cannellini beans, drained and rinsed; 1 (14.5-oz) can no-salt-added diced tomatoes; 3 Tbsp pitted kalamata olives, coarsely chopped; 1 Tbsp drained capers; 1 tsp Italian seasoning; 1 (18-oz) tube polenta, cut into 9 slices; 2 Tbsp chopped fresh basil