Protein-packed quick and easy pasta salad

Name: Protein-packed quick and easy pasta salad
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 150 g cherry tomatoes (1 cup); 1 small red onion; 1 bell pepper; 6-8 pitted black olives; roast chicken leftover (optional, we had leftover chicken); 1 can red beans (250 g, drained and rinsed); 1 can white beans (250 g, drained and rinsed); 250 g dried pasta like fusilli, penne, rotini or farfalle (1 cup); feta cheese (again optional, another leftover); salt; pepper; fresh basil; 5 tbsp olive oil; 0,5 tsp oregano; 0,5 tsp basil; salt; pepper; 1 tbsp lemon juice; 1 tsp tahini (if you don't like tahini leave it); 1 clove garlic