Melt 1 tablespoon butter in a medium skillet over medium-high heat. Add onion, garlic, and jalapenos and saute 3 to 4 minutes or until softened. Add rice, broth, lime juice, salt and 2 tablespoons cilantro. Bring to boil, cover and reduce heat to low. Cook 5 minutes, remove from heat and let stand 5 minutes. Fluff rice with fork and add remaining butter, cilantro and lime zest.For the shrimp, melt butter over medium-high heat in a separate medium skillet. Whisk in spices and add shrimp, cooking about 2 minutes per side or just until shrimp turn pink.To serve, divide Cilantro Lime Rice between 4 bowls. Top with shrimp and garnish with additional cilantro, lime wedges and avocado slices.