Preheat an oven to 350 degrees F (175 degrees C). Combine the panko, Parmesan cheese, parsley, salt, black pepper, and mustard powder in a bowl until evenly combined.
Melt the butter with the garlic in a skillet over low heat. Once melted, cook and stir the garlic for 5 minutes to flavor the butter. Pour into a mixing bowl once melted. Dip the pheasant pieces into the melted butter, then press into the panko crumbs. Place onto an ungreased baking sheet in a single layer. Sprinkle the remaining panko crumbs over the pheasant nuggets.
Bake in the preheated oven until the pheasant pieces are no longer pink in the center, about 45 minutes.
The nutrition data for this recipe includes the full amount of the breading ingredients. The actual amount of the breading consumed will vary.