In a small bowl, combine flour, thyme, and paprika. Using a pastry brush, brush steak pieces with Worcestershire sauce. Dredge in flour mixture.
Lightly coat a large nonstick skillet with cooking spray. Place on stove over medium-high heat. Add steak pieces and brown on both sides, about 5 minutes per side.
Transfer steak pieces to a 3-quart or larger crockery slow cooker. Top with garlic slices, celery, onions, and tomatoes. Pour beef broth over the top. Do not stir.
Cover and cook on Low for 8 to 10 hours or on High for 4 to 5 hours.
To serve, transfer steak pieces and vegetables to a heated serving platter. Spoon any pan juices over the top and serve at once.
This recipe yields 6 servings.
Exchanges Per Serving: 3 Lean Protein, 1/2 Carbohydrate (1 1/2 vegetable).
Nutrition Facts: 191 calories (21% calories from fat), 28 g protein, 4 g total fat (1.4 g saturated fat), 8 g carbohydrates, 2 g dietary fiber, 71 mg cholesterol, 102 mg sodium.