1. Preheat oven to 375°.
2. Combine panko, 1 tablespoon oil, 1 teaspoon garlic, and a dash of salt in a small bowl. Spread panko mixture in a single layer on a baking sheet. Bake at 375° for 6 minutes or until golden brown, stirring after 3 minutes. Cool.
3. Heat a large skillet over medium-low heat. Add remaining 2 tablespoons oil to pan, swirling to coat. Add onions to pan; cook 20 minutes or until golden brown, stirring occasionally. Add remaining 1 teaspoon garlic and wine. Increase heat to medium-high; cook 1 minute. Add broth; cook until liquid is reduced to 1/2 cup (about 4 minutes).
4. Cook pasta in boiling water with 1 tablespoon kosher salt according to package directions, omitting additional fat. Drain. Add pasta, remaining salt, and pepper to onion mixture; toss gently. Place about 1 cup pasta in each of 4 shallow bowls; sprinkle each serving with 2 tablespoons panko mixture.