Peel the plantains by cutting off the ends and making a lengthwise slit in the skin. Remove the peel and slice the plantains into 1-inch thick rounds.
Heat vegetable oil in a large skillet over medium heat. There should be enough oil to submerge the plantain slices halfway.
Fry the plantain slices in batches until golden and slightly tender, about 2-3 minutes per side. Remove from the oil and drain on paper towels.
Using a plantain press, the bottom of a glass, or a flat surface, gently flatten each fried plantain slice to about 1/4 inch thick.
Heat more vegetable oil in the skillet over medium-high heat.
Return the flattened plantains to the skillet and fry until they are crispy and golden brown, about 2-3 minutes per side.
Remove from the oil and drain on paper towels.
While still hot, sprinkle the patacones with salt, and if desired, ground black pepper and garlic powder.
Enjoy your meal!