Heat oil and butter in a skillet on medium heat. Add the garlic and cook until fragrant.

Add the shrimp and then add the chili powder, parsley, and salt. Cook until shrimp opaque

While shrimp is cooking

Combine sour cream, avocado, cilantro and lime juice in a small bowl and blend with an immersion blender until smooth.

Place the cabbage in a large bowl, add the avocado dressing and stir to combine.

Once shrimp is cooked, add some of the cabbage slaw to a tortilla, top with the shrimp and any other toppings you choose.