Step 1: Place diced potatoes in a large pot and cover with cold water. Add a pinch of salt. Bring to a boil, then reduce heat and simmer for 10-15 minutes, or until potatoes are fork-tender.
Step 2: Drain the potatoes thoroughly and return them to the empty pot. Mash them until smooth. Allow them to cool for 5-10 minutes.
Step 3: To the mashed potatoes, add the shredded cheddar cheese, grated Parmesan cheese, beaten egg, all-purpose flour, garlic powder, 1/2 tsp salt, 1/4 tsp black pepper, and 1/4 cup chopped fresh parsley. Mix until well combined.
Step 4: Place the panko breadcrumbs in a shallow dish. Take about 1-1.5 tablespoons of the potato mixture and roll it into a ball (about 1.5 inches in diameter). Gently roll each potato bomb in the panko breadcrumbs, ensuring it's fully coated. Repeat with the remaining mixture.
Step 5: Preheat oven to 400°F (200°C). Lightly grease a baking sheet or line with parchment paper. Arrange the potato bombs on the prepared baking sheet, leaving a little space between each.
Step 6: In a small microwave-safe bowl, melt the unsalted butter. Stir in the minced garlic. Brush about half of the garlic butter over the potato bombs.
Step 7: Bake for 12-15 minutes. Flip the potato bombs, brush with the remaining garlic butter, and bake for another 10-13 minutes, or until golden brown and crispy.
Step 8: Remove from oven, sprinkle with extra fresh parsley if desired, and serve immediately. Enjoy your irresistible Crispy Cheesy Potato Bombs with Garlic Butter!