Cut tops off bell peppers; reserve. Discard seeds.
Place peppers in a microwave-safe baking dish; cover with damp paper towels. Microwave at HIGH 6 minutes.
Let stand 5 minutes.
Combine 1/2 teaspoon black pepper, 1/4 cup broth, and next 5 ingredients. Divide beef mixture among peppers; top with tops.
Pour 2 cups water into dish; cover.
Bake at 400 for 45 minutes.
Sprinkle peppers with 1/4 cup parsley.
Heat a medium skillet over medium-high heat.
Add oil to pan.
Add onion; saut for 8 minutes, stirring occasionally.
Add garlic; saut for 30 seconds.
Add 1/2 teaspoon black pepper, 1/4 cup broth, tomatoes, and the next 4 ingredients; bring to a boil. Reduce heat; simmer 30 minutes. Stir in 1/4 cup parsley and yogurt.