1. Preheat oven to 450°.
2. Heat a large nonstick skillet over medium-high heat. Add sausage to pan; sauté 4 minutes or until browned, stirring occasionally. Remove from pan.
3. Add oil to pan. Add onion, fennel, and salt; cover and cook 10 minutes or until tender and lightly browned, stirring occasionally.
4. Place pizza crust on a baking sheet. Top evenly with onion mixture; sprinkle with cheese, and top evenly with sausage. Bake at 450° for 12 minutes or until cheese melts. Sprinkle evenly with chives. Cut pizza into 8 wedges.