To a medium size microwave-safe bowl, add onion, butter, and garlic. Microwave, uncovered, on high for 3 minutes.
Into a glass measuring cup or small bowl, add the broth. Cook on high just until heated but not boiling, about 2 - 2 1/2 minutes.
Add rice and broth to the onion mixture. Cover and cook, covered, on high for 6 minutes.
Stir in white wine then cover again and cook for an additional 10 minutes.
Stir in parmesan cheese and peas. Grind black pepper over the top and serve warm.