Place the chicken thighs into a large gallon-size zip-top bag.
Add the all-purpose flour, black pepper, smoked paprika, and salt to the bag, seal, and shake until each piece is evenly coated.
Pour enough vegetable or canola oil into a large deep skillet to reach about 1/4 inch depth and heat over medium-high until shimmering.
Carefully add the coated chicken to the hot oil and cook, turning as needed, until the pieces are light brown on all sides, about 10 minutes.
Reduce heat to low, cover the skillet, and simmer the chicken 35 to 40 minutes, turning once or twice so it cooks evenly.
During the last 5 minutes, remove the lid to allow the skin to crisp.
Cook until the juices run clear and an instant-read thermometer inserted into the thickest part reads 165°F (74°C).
Transfer the chicken to a paper towel–lined plate to drain before serving.