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In a medium bowl, mix together ricotta, Parmesan, lemon zest, basil, and oregano; set aside.
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Heat a large skillet over medium heat. Once pan is hot, add oil and garlic. Saute garlic, stirring constantly, for 1 minute. Add spinach. Cook until spinach wilts, 2 to 4 minutes. Remove to a bowl.
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Butter one side of each of the 4 pieces of bread. Sprinkle the butter side of the bread with garlic powder, to your liking.
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Place bread, buttered side down, in the same skillet that you used for the spinach. spread half the ricotta mixture over the bread. Layer 1/2 the spinach on top of the ricotta. Top sandwich with a second piece of bread, buttered side up.
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Cook until bread is golden brown, 2 to 3 minutes. Flip sandwich over, and cook for another 2 to 3 minutes, until bread is golden and cheese has melted.
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Cut in half and serve warm...or cold. I ate the second sandwich right of the fridge and it was still totally delicious!