Artichoke Risotto

This might be my favorite risotto combination ever-I like fresh spinach added, asparagus is wonderful, but artichokes are the perfect addition to an already delicious dish.

5 1/2 cups (or more) low-salt chicken broth
2 tablespoons butter, divided
2 tablespoons extra-virgin olive oil
1 cup finely chopped onion
8 baby artichokes, trimmed, halved-or the frozen bag from Trader Joe's
1 1/2 cups arborio rice (about 10 ounces)
1/2 cup dry white wine
1/2 cup finely grated Parmesan cheese

To prepare:

Bring broth to simmer in saucepan. Remove from heat. Cover; keep warm.
Melt 1 tablespoon butter with oil in heavy pot over medium-high heat. Add onion; sauté until soft and golden, about 5 minutes. Pat artichokes dry and add to pot. Sprinkle with salt and pepper. Cover and cook until artichokes begin to brown, stirring often, about 8 minutes. Add rice; stir 2 minutes. Add wine; stir until absorbed, about 1 minute. Add 1 1/2 cups warm broth; cook until absorbed, stirring often, about 5 minutes. Add more broth, 1/2 cupful at a time, allowing each addition to be absorbed before adding next and stirring often, until rice is just tender and mixture is creamy, about 20 minutes longer. Remove from heat; stir in cheese and 1 tablespoon butter. Season with salt and pepper. Transfer to bowl and serve.