Prepare pasta according to package directions and drain. Rinse pasta under cold water to cool. Combine 2 1/2 cups milk, vegetables, thyme, paprika and pasta in a saucepan. Cook over medium heat until hot but not boiling.
Combine remaining 1/2- cup milk and cornstarch and mix until cornstarch dissolves. Stir cornstarch into soup and return to simmer. Add clams and simmer for 3 minutes. Season with salt and cracked black pepper.