In the center of a 9×13 baking dish, add the potatoes, carrots, onions, fennel, garlic, salt, and pepper. Toss with 1 ½ tablespoons olive oil, then push into an even layer. Add the fresh herbs to the center of the pan in a pile so the chicken will cover them. Pour 1/2 cup chicken broth into the pan from the side corner (If not adding carrots, increase broth to 1 cup). PREP AHEAD: Take care the cut side of the potatoes are submerged in broth, or they will discolor. Alternatively, add them just before roasting.