Fried Yellow Squash with Potatoes and Onions

1 cup vegetable oil

½ yellow onion, diced

4 potatoes, peeled and sliced

3 yellow squash, sliced

¼ cup butter

1 teaspoon paprika

1 teaspoon ground black pepper

1 teaspoon minced garlic

1 teaspoon salt

½ teaspoon red pepper flakes

Heat vegetable oil in a large skillet over high heat until oil is hot; decrease heat to medium. Cook and stir onion and potatoes in the hot oil until potatoes are lightly browned and partially cooked, 15 to 20 minutes. Add squash, butter, paprika, black pepper, garlic powder, salt, and red pepper flakes; cook until potatoes are golden brown, 15 to 20 more minutes, turning occasionally. Remove from skillet with a slotted spoon.