Preheat oven to 375 °F (190 °C).

In a skillet over medium heat, cook the ground sausage until browned and cooked through. Drain any excess fat.

In a bowl, combine cooked sausage, shredded cheddar, chopped green onions, grated Parmesan, and black pepper.

Place a wonton wrapper on a clean surface, spoon about 1 teaspoon of the sausage mixture into the center.

Moisten the wrapper edges with water, fold into a triangle, pressing to seal. Repeat for all wrappers.

Arrange wontons on a parchment-lined baking sheet. Brush tops with olive oil or melted butter.

Bake for 10–12 minutes, or until golden brown and crispy.

Let cool slightly before serving.