Slice the tops off the peppers and remove the seeds; cut each pepper into 1/4-inch rings. Place in a bowl and sprinkle enough corn starch to coat and toss well. Set these on a rack..
Place 1 inch oil in a heavy pot or wok and heat over medium-high heat until hot but not smoking.
Meanwhile, in a medium bowl, with an electric beater on medium speed, beat milk, flour,baking powder, and salt until smooth. Dip a few pepper rings into the batter, allowing excess batter to drip back into bowl. Reduce heat to medium and carefully place rings in oil one at a time; fry 2 to 3 minutes, until golden, turning halfway through cooking. Drain on rack or paper towels. Salt and sprinkle paprika on rings while hot and just removed.
Continue until remaining pepper rings are fried, adding more oil as needed. Serve immediately,