Corn, green bean and spinach saute

1 tablespoon olive oil
1 box (10 ounces) frozen corn kernels
1 box (10 ounces) frozen cut green beans
5 ounces baby spinach
1/4 teaspoon dried thyme leaves
coarse salt and ground pepper
2 teaspoons white-wine vinegar

Directions
In a large skillet, heat oil over medium-high. Add corn and green beans, and cook until green beans are warmed through, 4 to 6 minutes.
Add spinach and thyme; season with salt and pepper. Cook, tossing, until spinach is wilted, 1 to 2 minutes. Stir in vinegar; season with salt and pepper.