Greek pasta with chicken sausages

I wanted to make this dish again, but was not in the mood for chicken. I went to WF's and found a chicken sausage with spinach and feta. It seemed like the perfect option to add to the Greek pasta!

• 1 (16 ounce) package penne pasta
• 1 1/2 tablespoons butter
• 1/2 cup chopped red onion
• 2 cloves garlic, minced
• 1 pound chicken sausage - cut into bite-size pieces
• 1 T capers
• 2 tomatoes, chopped
• 1/2 cup crumbled feta cheese
• 3 tablespoons chopped fresh parsley (I used dried)
• 2 tablespoons lemon juice
• 1 teaspoon dried oregano
• salt to taste
• ground black pepper to taste