1 pound dry spinach fettuccine
1/2 cup chopped fresh cilantro, divided
2 tablespoons minced garlic (about 6 cloves)
2 tablespoons minced jalapeño pepper, seeds and veins removed if desired
3 tablespoons unsalted butter, divided
1/2 cup chicken broth
2 tablespoons gold tequila
2 tablespoons lime juice (from about 2 limes)
3 tablespoons soy sauce
1 1/4 pounds chicken breast, cut into 3/4-inch pieces
1/4 red onion, thinly sliced
1/2 red bell pepper, thinly sliced
1/2 yellow bell pepper, thinly sliced
1/2 green bell pepper, thinly sliced
1 1/2 cups heavy cream