Step 1

Preheat oven to 425 degrees F (220 degrees C). Place a 12-inch cast iron skillet into the oven while it preheats.

Step 2

Heat a large skillet over medium-high heat. Cook and stir sausage in the hot skillet until browned and crumbly, 5 to 7 minutes; drain and discard grease.

Step 3

Combine eggs, milk, flour, 1 tablespoon butter, salt, and pepper in a blender; blend until batter is smooth and thin, about 2 minutes.

Step 4

Carefully remove cast iron skillet from oven using an oven mitt and pour remaining 1 tablespoon butter into the skillet, quickly and carefully swirling to coat the skillet with butter. Pour batter into the skillet and transfer to the oven.

Step 5

Bake in the oven until puffed around the edges and cooked through, 18 to 20 minutes.

Step 6

Top Dutch baby with Cheddar cheese, chives, fresh thyme, and crumbled sausage. Return to the oven and bake until cheese is melted, about 1 minute. Slice and serve Dutch baby immediately.