Spinach and Feta Pasta

Ingredients
1 (8 ounce) package penne pasta
2 tablespoons olive oil
1/2 cup chopped onion
1 clove garlic, minced
3 cups chopped tomatoes
1 can sliced black olives
2 cups spinach leaves, packed
salt and pepper to taste
1 pinch red pepper flakes
8 ounces feta cheese, crumbled

Directions
1. Bring a large pot of lightly salted water to a boil. Cook pasta in boiling water until al dente; drain.

2. Meanwhile, heat olive oil in a large skillet over medium-high heat; add onion and garlic, and cook until golden brown. Mix in tomatoes, olives, and spinach. Season with salt, pepper, and red pepper flakes. Cook 2 minutes more, until tomatoes are heated through and spinach is wilted. Reduce heat to medium, stir in pasta and feta cheese, and cook until heated through.