Preheat grill to medium-high. Combine cheddar and gruyere in a small bowl. Gently mix beef, Worcestershire, paprika and pepper in a large bowl, preferably with your hands, without overworking. Shape into 8 thin, 4" wide patties.
Mound 2 Tbsp. of the cheese mixture on each of 4 patties, leaving a 1/2" border. Cover each with one of the remaining patties. Crimp and seal and edges closed.
To grill: Lightly oil and grill rack. Grill the stuffed patties over medium-high heat, about 4 minutes per side for medium-well. (Be sure not to press the burgers as they cook or they'll split open and the cheese will ooze out.) Let the burgers stand for 5 minutes before serving.
Calories From Fat
% Daily Value*
Total Fat 0g
Saturated Fat 0g
Trans Fat 0g
Dietary Fibers 0g
* Percent Daily Values are based on a 2,000 calorie diet.
* Nutrition information is estimated based on the ingredients and cooking instructions as described in each recipe and is intended to be used for informational purposes only. Please note that nutrition details may vary based on methods of preparation, origin and freshness of ingredients used.