Preheat the oven to 360 F. In a deep bowl, mix dry ingredients - two types of flour, baking powder, baking soda, ground cinnamon. Use a whisk. In another bowl, combine sugar, vegetable oil and butter, beat until fluffy or just until combined.
Next, pour vanilla extract into a bowl with butter and sugar, and also add an egg. Continue stirring until completely combined. Add dry ingredients and mix until you get a soft and fairly crumbly dough. Cover with foil and leave for half an hour.
To make the streusel, place the flour, sugar, cinnamon, and cubes of butter in a bowl. Stir until you get an oily crumb mixture. Use a spoon or your hands to form cookie dough into small balls, about 2 inches in diameter, and place on a parchment-lined baking sheet.
Then make a deepening in each ball, pour streusel into it. You can also make flatter cookies and sprinkle streusel on top as well.
Place the baking sheet in the hot oven and bake for 8-11 minutes. The longer the cookies bake, the firmer and crispier they will be. Remove the finished cookies and let cool.
While it is cooling, make a frosting with lemon juice and powdered sugar. Ready cookies with glaze and leave for another half an hour on the table for solidification. Cookies can be stored in a container with a lid.