How do I stop my mash from being lumpy?

Online Answer
Unwanted lumps are a result of mashing undercooked potato, so the key to avoiding lumps is cooking the potatoes correctly. Make sure that your potatoes are all cut roughly the same size so they cook at the same rate. And unlike pasta, potatoes should be started in cold water.
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2. My potatoes are lumpy. Lumpy mashed potatoes generally mean undercooked potatoes. If you get to this point and you realize you've undercooked your potatoes, just add a little bit of milk or cream and cook the potatoes over a low heat until the lumps begin to soften..
Measure out 3 tablespoons of the reserved fat and add it to the pan. If you're short, add melted butter to the pan to make up the amount. When the fat is hot, sprinkle in the flour.
Mistake to Avoid #3: Lumpy Mashed Potatoes Unwanted lumps are a result of mashing undercooked potato, so the key to avoiding lumps is cooking the potatoes correctly. Make sure that your potatoes are all cut roughly the same size so they cook at the same rate. And unlike pasta, potatoes should be started in cold water.
2. My potatoes are lumpy. Lumpy mashed potatoes generally mean undercooked potatoes. If you get to this point and you realize you've undercooked your potatoes, just add a little bit of milk or cream and cook the potatoes over a low heat until the lumps begin to soften..