Roasted Corn with shallots

2 cups corn kernels , thawed if frozen 2 tablespoons butter , divided 1/2 cup red onion , diced 1 teaspoon garlic , chopped 1 sweet red pepper, diced 2[...]

1 tablespoon olive oil 3 cups fresh corn kernels (may use frozen) 2 tablespoons chopped red onions (green onion, shallots, and regular onion work fine.) 1[...]