Combine first 4 ingredients; set aside.
Heat a large nonstick skillet over medium-high heat. Remove the casings from sausage. Add sausage and onion to pan; cook 4 minutes, stirring to crumble sausage. Add tomatoes; cook 2 minutes, stirring frequently. Stir in beans. Pour egg mixture over bean mixture; cover and cook 3 minutes. Uncover; sprinkle with cheese. Wrap handle of skillet with foil. Broil for 5 minutes or until set.