Mediterranean Baked Chicken
Ingredients:
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2 (8 ounce) skinless, boneless chicken breasts
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salt and ground black pepper to taste
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1 lemon, juiced, divided
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1 small yellow onion, roughly chopped
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¼ cup olive oil
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2 cloves garlic, diced
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1 teaspoon dried Greek oregano
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1 tablespoon olive oil, or as needed
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1 cup grape tomatoes, halved
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½ (10 ounce) bag fresh spinach
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½ cup crumbled feta cheese