Gather all ingredients. In a large bowl, add the mashed potatoes, cheddar cheese, and chopped parsley and mix.
Beat one egg in a small bowl. Add panko bread crumbs to a shallow bowl and the flour to a third bowl.
Scoop the mashed potato mix into a small ball shape, roughly 3 tbsp. in size, and roll in flour to coat. Next, dip in egg and let excess drip off. Then, roll the potato ball in bread crumbs until thoroughly coated. Place on a large baking sheet.
In a large skillet or pan, heat oil on medium-high heat. Gently place each croquette into the hot oil. Fry each side of the croquette for one minute or until golden brown. Place on a wire rack or paper towel to soak up excess oil. Repeat the process until all croquettes are cooked.
Serve while warm with a ramekin of Toby’s Ranch Dressing & Dip. Enjoy your Cheesy Garlic Potato Croquettes!