First things first, grab your zucchini. Wash them under running water, and then pat them dry. Slice the zucchini into thin rounds. This ensures they cook evenly. If you want a little extra flavor, sprinkle some salt on the zucchini slices and let them sit for about 10 minutes. This will draw out the excess moisture.

In a large skillet, melt the butter over medium heat. Add the minced shallots and sauté them for around 2-3 minutes. You want them soft but not browned. They should become fragrant and slightly translucent. This will serve as a flavorful base for the frittata.

Next, add the sliced zucchini to the skillet. Cook them until they are tender and lightly browned. This will take around 5-7 minutes. Stir occasionally to ensure even cooking. At this point, feeling the heat and getting that sweet, buttery smell wafting from the pan is half the fun.

While your zucchini is cooking, whisk the eggs in a bowl. Add in the heavy cream, garlic powder, salt, and black pepper. Whisk until everything is well combined. The texture should be fluffy and light.

Once the zucchini is cooked, pour the egg mixture into the skillet. Gently stir to distribute the zucchini evenly. Then top it with shredded Cheddar cheese. Trust me; this will add an irresistible gooeyness to your frittata.

Allow the frittata to cook on the stovetop for about 5 minutes, just until the edges start to set. Keep an eye on it to ensure the bottom doesn't burn.

Now, here comes the fun part! Preheat your oven to 375°F (190°C). Transfer the skillet to the oven and bake for 15-20 minutes. You're looking for the middle to be set and the top to be slightly golden. After baking, it should puff up beautifully!

Once it's done, remove the skillet from the oven and let it cool for a few minutes. Garnish with chopped chives before slicing into wedges and serving. This dish is best enjoyed warm, but it can also be served at room temperature.