In a small bowl, combine marinade ingredients.
Slice bell peppers and onions the same 1/3 inch thickness and place in a zip lock bag. Pour half the marinade over the top, seal the bag and toss to coat.
Pat dry the shrimp with a paper towel and place in a separate zip lock back. Pour remaining marinade over the top, seal, and toss to coat.
Heat a large heavy pan over medium heat with 1/2 tablespoon oil and when hot, add shrimp in single layer and saute 1-2 minutes per side or until just cooked through. Transfer to a plate.
In the same pan, add marinated vegetables and saute until soft and golden brown at the edges (about 10 minutes) stirring occasionally. Then turn off heat.
Add shrimp back to the pan along with 1/4 cup cilantro. Squeeze fresh lime juice to taste and toss.
Serve with warm tortillas and jalapeno ranch.