Cilantro Lime Shrimp Lettuce Wraps

smoked paprika

dried oregano

cumin

garlic powder

salt and black pepper,

butter or olive oil, divided

medium shrimp, shelled and deveined

lime juice

to 4 tablespoons chopped fresh cilantro

medium onion, sliced thinly

medium bell peppers (I used a combo of red, yellow and green), cored, deseeded and sliced thinly

head butter lettuce, leaves washed and dried

sliced avocado and lime wedges, for serving