Ahhh .... it looks like it is your food choices raising your blood sugar levels. I certainly could not eat any of the things you mention without massive spikes.
These are the main culprits in raising BS levels - bread, rice, potatoes, cereals, pasta, most fruit, anything made with or thickened with flour, and of course anything containing sugar. These are all full of carbohydrate. All carbs convert to glucose once inside the system, so it makes sense not to eat too much of it. Glucose in the system is exactly what we don';t want, as diabetics. No doubt you have been told by your nurse to eat carbs with every meal and wholemeal foods. This is poor advice, but sadly it is the advice most of us get when first diagnosed, and then we wonder why our levels aren't improving.
Jacket and mashed spuds are the worst sort of spud. A couple of new spuds may be OK. Breakfast cereals are not a wise choice for the majority of us. Baked beans are delicious, but sadly they are full of sugar. Fruits are also full of sugar, and bananas are about the worst. They are instant glucose, which is why you see athletes eating them during competitions. Berries are generally not too bad.
The fewer grams of carbs you eat, the better your BS levels will become. You then need to make up your energy requirements by increasing your dietary fats. Try having eggs for breakfast (cooked any which way but no bread), or bacon and eggs with a tomato and mushrooms. I often have that for lunch. Before you open a tin of anything, have a look at the total carb content per 100g on the nutrition label (ignore the "of which sugars") Anything above 10g per 100g is high.
Your best bet is to test before you eat and then again 2 hours after your first bite. Look at the rise. Anything above 2mmol/l is high, preferably keep it below 1.5mmol/l. If it is too high your meal was not doing you any favours and you need to look carefully at what you ate and try to reduce the carb content, either by eliminating things like bread/spuds/baked beans or cutting down the portion size until your testing tells you that was OK. . Using this method of testing is the only way to find yourself a suitable diet.
Do read round these forums. There is a wealth of information. Please ask questions.
A note of warning - if you do go down the low carb route, your medication will probably, almost definitely, need reducing or you may start having hypos, so do discuss this with your nurse.