

Preheat your oven to 375°F (190°C). Grease a 12-cup muffin tin or line it with paper liners for easier cleanup and serving.
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In a large bowl, whisk together:
Flour
Baking powder
Salt
Black pepper
Garlic powder (if using)
Mix thoroughly to evenly distribute the leavening agents and seasonings.
In another bowl, mix the following until well blended:
Mashed potatoes
Beaten egg
Milk
Melted butter or olive oil
Stir until the mixture is smooth and creamy. If using any optional ingredients such as green onions, bacon bits, or sautéed spinach, fold them in now.
Add the wet mixture to the dry flour mix. Gently stir until just combined; do not overmix, as this could make the muffins tough. Fold in:
Shredded cheddar
Grated Parmesan cheese
This batter should be thick but moist.
Divide the batter evenly between the 12 muffin cups, filling each about ¾ full. For added flair and taste, sprinkle a bit of shredded cheese or dried herbs like thyme or rosemary on top before baking.
Place the muffin tray in the preheated oven. Bake for 20–25 minutes, or until the tops are golden and a toothpick inserted into the center comes out clean. The muffins should be lightly crisp on the outside and fluffy within.
Let them cool in the pan for about 5 minutes, then transfer them to a wire rack to cool further.
Serve these muffins warm for the best texture and flavor. They pair wonderfully with:
A dollop of sour cream or Greek yogurt
A side of soup or salad
Breakfast items like scrambled eggs or omelets