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Cook pasta according to package directions. Drain well.
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Meanwhile in a large skillet, heat 1 tsp olive oil over medium heat. Squeeze sausage out of casing directly into skillet, breaking up any large pieces with spoon. Cook until brown. Transfer to plate.
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Add remaining 1 tsp to skillet. Cook onions and garlic for about 3 minutes.
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Stir in tomatoes, oregano, pepper, and sausage. Increase heat to bring to simmer. Reduce heat and allowed to simmer uncovered for about 5 minutes. Add spinach and only cook until spinach is slightly wilted. Remove from heat.
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Add pasta to sausage mixture and stir well. After dishing up appropriate serving size to plate, sprinkle with feta cheese and additional oregano, if desired. Serve and enjoy!